feat(api): add internal API foundation for UI

- Create api package with AuthService, InstanceService, LaunchService
- Add ApiResponse<T> model for consistent responses
- Create LauncherAPI central facade for all services
- Update Main.java to use new API for session checking
- All services compile successfully

launcher/src/main/java/me/sashegdev/zernmc/launcher/Main.java

@@ -1,5 +1,6 @@
 package me.sashegdev.zernmc.launcher;
 
+import me.sashegdev.zernmc.launcher.api.LauncherAPI;
 import me.sashegdev.zernmc.launcher.auth.AuthManager;
 import me.sashegdev.zernmc.launcher.menu.*;
 import me.sashegdev.zernmc.launcher.ui.ArrowMenu;
@@ -16,6 +17,7 @@ import java.util.List;
 public class Main {
 
     private static final String CURRENT_VERSION = Version.getCurrentVersion();
+    private static final LauncherAPI api = new LauncherAPI();
 
     public static void main(String[] args) throws IOException {
         System.setProperty("org.jline.terminal.disableDeprecatedProviderWarning", "true");
@@ -32,11 +34,11 @@ public class Main {
 
         checkAndAutoUpdateLauncher();
 
-        // === АВТОРИЗАЦИЯ ===
+        // === АВТОРИЗАЦИЯ (используем новый API) ===
         System.out.println(ZAnsi.cyan("Проверка авторизации..."));
-        boolean sessionRestored = AuthManager.loadSavedSession();
+        var sessionResponse = api.checkSession();
 
-        if (!sessionRestored) {
+        if (!sessionResponse.isSuccess()) {
             LoginMenu loginMenu = new LoginMenu();
             boolean loggedIn = loginMenu.show();
             if (!loggedIn) {
@@ -45,7 +47,8 @@ public class Main {
                 System.exit(0);
             }
         } else {
-            System.out.println(ZAnsi.brightGreen("Добро пожаловать обратно, " + AuthManager.getUsername() + "!"));
+            var sessionInfo = sessionResponse.getData();
+            System.out.println(ZAnsi.brightGreen("Добро пожаловать обратно, " + sessionInfo.getUsername() + "!"));
         }
 
         // === ГЛАВНЫЙ ЦИКЛ ===

launcher/src/main/java/me/sashegdev/zernmc/launcher/api/ApiResponse.java

@@ -0,0 +1,33 @@
+package me.sashegdev.zernmc.launcher.api;
+
+public class ApiResponse<T> {
+    private boolean success;
+    private T data;
+    private String error;
+
+    public ApiResponse(boolean success, T data, String error) {
+        this.success = success;
+        this.data = data;
+        this.error = error;
+    }
+
+    public static <T> ApiResponse<T> success(T data) {
+        return new ApiResponse<>(true, data, null);
+    }
+
+    public static <T> ApiResponse<T> error(String error) {
+        return new ApiResponse<>(false, null, error);
+    }
+
+    public boolean isSuccess() {
+        return success;
+    }
+
+    public T getData() {
+        return data;
+    }
+
+    public String getError() {
+        return error;
+    }
+}

launcher/src/main/java/me/sashegdev/zernmc/launcher/api/LauncherAPI.java

@@ -0,0 +1,74 @@
+package me.sashegdev.zernmc.launcher.api;
+
+import me.sashegdev.zernmc.launcher.api.auth.AuthService;
+import me.sashegdev.zernmc.launcher.api.instance.InstanceService;
+import me.sashegdev.zernmc.launcher.api.launch.LaunchService;
+
+import java.util.List;
+
+/**
+ * Центральный фасад для внутреннего API лаунчера.
+ * Используется как единая точка входа для UI и других компонентов.
+ */
+public class LauncherAPI {
+
+    private final AuthService authService;
+    private final InstanceService instanceService;
+    private final LaunchService launchService;
+
+    public LauncherAPI() {
+        this.authService = new AuthService();
+        this.instanceService = new InstanceService();
+        this.launchService = new LaunchService();
+    }
+
+    public AuthService auth() {
+        return authService;
+    }
+
+    public InstanceService instances() {
+        return instanceService;
+    }
+
+    public LaunchService launch() {
+        return launchService;
+    }
+
+    // ====================== Удобные методы ======================
+
+    public boolean isLoggedIn() {
+        return authService.isLoggedIn();
+    }
+
+    public String getCurrentUsername() {
+        return authService.getCurrentUsername();
+    }
+
+    public ApiResponse<AuthService.SessionInfo> checkSession() {
+        return authService.checkSession();
+    }
+
+    public ApiResponse<AuthService.LoginResult> login(String username, String password) {
+        return authService.login(username, password);
+    }
+
+    public ApiResponse<Boolean> logout() {
+        return authService.logout();
+    }
+
+    public ApiResponse<List<InstanceService.InstanceInfo>> getAllInstances() {
+        return instanceService.getAllInstances();
+    }
+
+    public ApiResponse<LaunchService.InstanceInfo> getLaunchInfo(String instanceName) {
+        return launchService.getLaunchInfo(instanceName);
+    }
+
+    public ApiResponse<LaunchService.LaunchInfo> prepareLaunch(String instanceName) {
+        return launchService.prepareLaunch(instanceName);
+    }
+
+    public ApiResponse<LaunchService.ProcessInfo> launch(String instanceName) {
+        return launchService.launch(instanceName);
+    }
+}

launcher/src/main/java/me/sashegdev/zernmc/launcher/api/auth/AuthService.java

@@ -0,0 +1,134 @@
+package me.sashegdev.zernmc.launcher.api.auth;
+
+import me.sashegdev.zernmc.launcher.api.ApiResponse;
+import me.sashegdev.zernmc.launcher.auth.AuthManager;
+import me.sashegdev.zernmc.launcher.utils.ZHttpClient;
+
+import java.io.IOException;
+
+public class AuthService {
+
+    public ApiResponse<LoginResult> login(String username, String password) {
+        try {
+            AuthManager.AuthResult result = AuthManager.login(username, password);
+            if (result.success) {
+                LoginResult loginResult = new LoginResult(AuthManager.getUsername(), AuthManager.getAccessToken());
+                return ApiResponse.success(loginResult);
+            }
+            return ApiResponse.error(result.error != null ? result.error : "Неверный логин или пароль");
+        } catch (Exception e) {
+            return ApiResponse.error("Ошибка авторизации: " + e.getMessage());
+        }
+    }
+
+    public ApiResponse<Boolean> logout() {
+        try {
+            AuthManager.logout();
+            return ApiResponse.success(true);
+        } catch (Exception e) {
+            return ApiResponse.error("Ошибка при выходе: " + e.getMessage());
+        }
+    }
+
+    public ApiResponse<SessionInfo> checkSession() {
+        try {
+            boolean restored = AuthManager.loadSavedSession();
+            if (restored) {
+                SessionInfo info = new SessionInfo(
+                        AuthManager.getUsername(),
+                        AuthManager.getAccessToken(),
+                        AuthManager.hasActivePass()
+                );
+                return ApiResponse.success(info);
+            }
+            return ApiResponse.error("Сессия не найдена");
+        } catch (Exception e) {
+            return ApiResponse.error("Ошибка проверки сессии: " + e.getMessage());
+        }
+    }
+
+    public ApiResponse<Boolean> activatePass(String passCode) {
+        try {
+            String response = post("/auth/pass/activate",
+                    "{\"code\":\"" + passCode + "\"}");
+            return ApiResponse.success(true);
+        } catch (Exception e) {
+            return ApiResponse.error("Ошибка активации проходки: " + e.getMessage());
+        }
+    }
+
+    private String post(String endpoint, String jsonBody) throws Exception {
+        String fullUrl = ZHttpClient.getBaseUrl() + endpoint;
+        java.net.URL url = new java.net.URL(fullUrl);
+        java.net.HttpURLConnection conn = (java.net.HttpURLConnection) url.openConnection();
+
+        conn.setRequestMethod("POST");
+        conn.setRequestProperty("Content-Type", "application/json; charset=utf-8");
+        conn.setRequestProperty("Accept", "application/json");
+        conn.setRequestProperty("User-Agent", "ZernMC-Launcher/1.0");
+
+        if (AuthManager.getAccessToken() != null && !AuthManager.getAccessToken().equals("0")) {
+            conn.setRequestProperty("Authorization", "Bearer " + AuthManager.getAccessToken());
+        }
+
+        conn.setDoOutput(true);
+
+        try (var os = conn.getOutputStream()) {
+            byte[] input = jsonBody.getBytes(java.nio.charset.StandardCharsets.UTF_8);
+            os.write(input);
+        }
+
+        int statusCode = conn.getResponseCode();
+        var is = (statusCode >= 200 && statusCode < 300) ? conn.getInputStream() : conn.getErrorStream();
+
+        String responseBody;
+        try (var scanner = new java.util.Scanner(is, java.nio.charset.StandardCharsets.UTF_8.name())) {
+            responseBody = scanner.useDelimiter("\\A").hasNext() ? scanner.next() : "";
+        }
+
+        conn.disconnect();
+
+        if (statusCode != 200) {
+            throw new IOException("HTTP " + statusCode + ": " + responseBody);
+        }
+
+        return responseBody;
+    }
+
+    public boolean isLoggedIn() {
+        return AuthManager.isLoggedIn();
+    }
+
+    public String getCurrentUsername() {
+        return AuthManager.getUsername();
+    }
+
+    public static class LoginResult {
+        private String username;
+        private String token;
+
+        public LoginResult(String username, String token) {
+            this.username = username;
+            this.token = token;
+        }
+
+        public String getUsername() { return username; }
+        public String getToken() { return token; }
+    }
+
+    public static class SessionInfo {
+        private String username;
+        private String token;
+        private boolean passActive;
+
+        public SessionInfo(String username, String token, boolean passActive) {
+            this.username = username;
+            this.token = token;
+            this.passActive = passActive;
+        }
+
+        public String getUsername() { return username; }
+        public String getToken() { return token; }
+        public boolean isPassActive() { return passActive; }
+    }
+}

launcher/src/main/java/me/sashegdev/zernmc/launcher/api/instance/InstanceService.java

@@ -0,0 +1,98 @@
+package me.sashegdev.zernmc.launcher.api.instance;
+
+import me.sashegdev.zernmc.launcher.api.ApiResponse;
+import me.sashegdev.zernmc.launcher.minecraft.Instance;
+import me.sashegdev.zernmc.launcher.minecraft.InstanceManager;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class InstanceService {
+
+    public ApiResponse<List<InstanceInfo>> getAllInstances() {
+        try {
+            List<Instance> instances = InstanceManager.getAllInstances();
+            List<InstanceInfo> infoList = instances.stream()
+                    .map(this::toInstanceInfo)
+                    .collect(Collectors.toList());
+            return ApiResponse.success(infoList);
+        } catch (IOException e) {
+            return ApiResponse.error("Ошибка получения списка сборок: " + e.getMessage());
+        }
+    }
+
+    public ApiResponse<InstanceInfo> getInstance(String name) {
+        try {
+            Instance instance = InstanceManager.getInstance(name);
+            if (instance == null) {
+                return ApiResponse.error("Сборка не найдена: " + name);
+            }
+            return ApiResponse.success(toInstanceInfo(instance));
+        } catch (Exception e) {
+            return ApiResponse.error("Ошибка получения сборки: " + e.getMessage());
+        }
+    }
+
+    public ApiResponse<InstanceInfo> createInstance(String name) {
+        try {
+            boolean created = InstanceManager.createInstanceFolder(name);
+            if (!created) {
+                return ApiResponse.error("Сборка с таким именем уже существует: " + name);
+            }
+            Instance instance = InstanceManager.getInstance(name);
+            return ApiResponse.success(toInstanceInfo(instance));
+        } catch (IOException e) {
+            return ApiResponse.error("Ошибка создания сборки: " + e.getMessage());
+        }
+    }
+
+    public ApiResponse<Boolean> deleteInstance(String name) {
+        try {
+            boolean deleted = InstanceManager.deleteInstance(name);
+            if (!deleted) {
+                return ApiResponse.error("Не удалось удалить сборку: " + name);
+            }
+            return ApiResponse.success(true);
+        } catch (Exception e) {
+            return ApiResponse.error("Ошибка удаления сборки: " + e.getMessage());
+        }
+    }
+
+    public ApiResponse<Boolean> isInstanceExists(String name) {
+        try {
+            Instance instance = InstanceManager.getInstance(name);
+            return ApiResponse.success(instance != null);
+        } catch (Exception e) {
+            return ApiResponse.error("Ошибка проверки сборки: " + e.getMessage());
+        }
+    }
+
+    private InstanceInfo toInstanceInfo(Instance instance) {
+        return new InstanceInfo(
+                instance.getName(),
+                instance.getPath().toString(),
+                instance.getMinecraftVersion(),
+                instance.getLoaderType()
+        );
+    }
+
+    public static class InstanceInfo {
+        private String name;
+        private String path;
+        private String version;
+        private String loaderType;
+
+        public InstanceInfo(String name, String path, String version, String loaderType) {
+            this.name = name;
+            this.path = path;
+            this.version = version;
+            this.loaderType = loaderType;
+        }
+
+        public String getName() { return name; }
+        public String getPath() { return path; }
+        public String getVersion() { return version; }
+        public String getLoaderType() { return loaderType; }
+    }
+}

launcher/src/main/java/me/sashegdev/zernmc/launcher/api/launch/LaunchService.java

@@ -0,0 +1,157 @@
+package me.sashegdev.zernmc.launcher.api.launch;
+
+import me.sashegdev.zernmc.launcher.api.ApiResponse;
+import me.sashegdev.zernmc.launcher.minecraft.Instance;
+import me.sashegdev.zernmc.launcher.minecraft.InstanceManager;
+import me.sashegdev.zernmc.launcher.minecraft.launch.LaunchCommandBuilder;
+import me.sashegdev.zernmc.launcher.minecraft.model.LaunchOptions;
+
+import java.io.IOException;
+import java.nio.file.Path;
+import java.util.List;
+
+public class LaunchService {
+
+    public ApiResponse<LaunchInfo> prepareLaunch(String instanceName) {
+        try {
+            Instance instance = InstanceManager.getInstance(instanceName);
+            if (instance == null) {
+                return ApiResponse.error("Сборка не найдена: " + instanceName);
+            }
+
+            LaunchCommandBuilder builder = new LaunchCommandBuilder(instance);
+            LaunchOptions options = new LaunchOptions();
+
+            List<String> command = builder.build(options);
+
+            LaunchInfo info = new LaunchInfo(
+                    instanceName,
+                    command,
+                    instance.getPath().toString()
+            );
+            return ApiResponse.success(info);
+        } catch (Exception e) {
+            return ApiResponse.error("Ошибка подготовки запуска: " + e.getMessage());
+        }
+    }
+
+    public ApiResponse<ProcessInfo> launch(String instanceName) {
+        try {
+            Instance instance = InstanceManager.getInstance(instanceName);
+            if (instance == null) {
+                return ApiResponse.error("Сборка не найдена: " + instanceName);
+            }
+
+            LaunchCommandBuilder builder = new LaunchCommandBuilder(instance);
+            LaunchOptions options = new LaunchOptions();
+
+            List<String> command = builder.build(options);
+
+            ProcessBuilder processBuilder = new ProcessBuilder(command);
+            processBuilder.directory(instance.getPath().toFile());
+            processBuilder.inheritIO();
+
+            Process process = processBuilder.start();
+
+            ProcessInfo info = new ProcessInfo(
+                    instanceName,
+                    process.pid(),
+                    "RUNNING"
+            );
+            return ApiResponse.success(info);
+        } catch (Exception e) {
+            return ApiResponse.error("Ошибка запуска: " + e.getMessage());
+        }
+    }
+
+    public ApiResponse<Boolean> isReady(String instanceName) {
+        try {
+            Instance instance = InstanceManager.getInstance(instanceName);
+            if (instance == null) {
+                return ApiResponse.error("Сборка не найдена: " + instanceName);
+            }
+
+            Path versionJson = instance.getPath().resolve("version.json");
+            boolean hasVersionJson = versionJson.toFile().exists();
+
+            return ApiResponse.success(hasVersionJson);
+        } catch (Exception e) {
+            return ApiResponse.error("Ошибка проверки готовности: " + e.getMessage());
+        }
+    }
+
+    public ApiResponse<InstanceInfo> getLaunchInfo(String instanceName) {
+        try {
+            Instance instance = InstanceManager.getInstance(instanceName);
+            if (instance == null) {
+                return ApiResponse.error("Сборка не найдена: " + instanceName);
+            }
+
+            InstanceInfo info = new InstanceInfo(
+                    instance.getName(),
+                    instance.getMinecraftVersion(),
+                    instance.getLoaderType(),
+                    instance.getLoaderVersion(),
+                    instance.getAssetIndex()
+            );
+            return ApiResponse.success(info);
+        } catch (Exception e) {
+            return ApiResponse.error("Ошибка получения информации: " + e.getMessage());
+        }
+    }
+
+    public static class LaunchInfo {
+        private String instanceName;
+        private List<String> command;
+        private String workingDirectory;
+
+        public LaunchInfo(String instanceName, List<String> command, String workingDirectory) {
+            this.instanceName = instanceName;
+            this.command = command;
+            this.workingDirectory = workingDirectory;
+        }
+
+        public String getInstanceName() { return instanceName; }
+        public List<String> getCommand() { return command; }
+        public String getWorkingDirectory() { return workingDirectory; }
+    }
+
+    public static class ProcessInfo {
+        private String instanceName;
+        private long pid;
+        private String status;
+
+        public ProcessInfo(String instanceName, long pid, String status) {
+            this.instanceName = instanceName;
+            this.pid = pid;
+            this.status = status;
+        }
+
+        public String getInstanceName() { return instanceName; }
+        public long getPid() { return pid; }
+        public String getStatus() { return status; }
+    }
+
+    public static class InstanceInfo {
+        private String name;
+        private String minecraftVersion;
+        private String loaderType;
+        private String loaderVersion;
+        private String assetIndex;
+
+        public InstanceInfo(String name, String minecraftVersion, String loaderType,
+                           String loaderVersion, String assetIndex) {
+            this.name = name;
+            this.minecraftVersion = minecraftVersion;
+            this.loaderType = loaderType;
+            this.loaderVersion = loaderVersion;
+            this.assetIndex = assetIndex;
+        }
+
+        public String getName() { return name; }
+        public String getMinecraftVersion() { return minecraftVersion; }
+        public String getLoaderType() { return loaderType; }
+        public String getLoaderVersion() { return loaderVersion; }
+        public String getAssetIndex() { return assetIndex; }
+    }
+}