test(server): add comprehensive test suite (47 tests), fix DB lock and schema bugs

- Add pytest test suite: test_auth.py, test_admin.py, test_pass.py,
  test_proxy.py, test_rate_limit.py, test_client_contract.py
- Fix SQLite 'database is locked' errors: moved log_audit() calls outside
  with get_db() blocks in register, login, logout, refresh, activate_pass
- Enable WAL mode and busy_timeout in get_db() for concurrent access
- Fix /admin/me: removed non-existent 'email' column from query
- Fix /admin/users list: disambiguated activated_at column in JOIN query
- Fix /auth/refresh: now returns refresh_token + expires_in + username/uuid/role
  to match AuthManager.AuthSession expectations; revokes old refresh token
- Fix conftest.py: unique usernames per test to avoid conflicts
- All 47 tests passing

server/admin_router.py

@@ -84,7 +84,7 @@ async def list_users(
                 user_data["is_active"] = row["is_active"]
                 # Получаем информацию о проходке
                 pass_info = conn.execute("""
-                    SELECT code, expires_at, activated_at
+                    SELECT p.code, p.expires_at, up.activated_at
                     FROM user_passes up
                     JOIN passes p ON up.pass_code = p.code
                     WHERE up.user_id = ? AND (p.expires_at IS NULL OR p.expires_at > ?)
@@ -560,7 +560,7 @@ async def get_my_info(current_user: dict = Depends(get_current_user)):
     """Информация о текущем пользователе с правами"""
     with get_db() as conn:
         row = conn.execute("""
-            SELECT id, username, email, uuid, role, created_at, last_login
+            SELECT id, username, uuid, role, created_at, last_login
             FROM users WHERE id = ?
         """, (current_user["id"],)).fetchone()
         
@@ -579,7 +579,6 @@ async def get_my_info(current_user: dict = Depends(get_current_user)):
         return {
             "id": row["id"],
             "username": row["username"],
-            "email": row["email"],
             "uuid": row["uuid"],
             "role": row["role"],
             "role_name": ROLE_NAMES.get(row["role"], "Неизвестно"),