fix: align all 212 tests with current API and add CI workflows

Update integration tests to match actual endpoint responses: remove
data wrappers, use snake_case fields, correct HTTP methods (PUT→POST
for directory create), status codes (200→204 for mutations), and
request formats (params→json for 2FA). Fix root-level and unit tests
for DatabaseManager migration, model CRUD patterns, and JWT setup.
Add GitHub Actions and Gitea CI configs with ubuntu-latest + Python 3.13.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/integration/conftest.py

@@ -417,12 +417,12 @@ async def async_client(initialized_db: AsyncSession) -> AsyncGenerator[AsyncClie
     """异步HTTP测试客户端"""
 
     # 覆盖依赖项，使用测试数据库
-    from middleware.dependencies import get_session
+    from sqlmodels.database_connection import DatabaseManager
 
     async def override_get_session():
         yield initialized_db
 
-    app.dependency_overrides[get_session] = override_get_session
+    app.dependency_overrides[DatabaseManager.get_session] = override_get_session
 
     transport = ASGITransport(app=app)
     async with AsyncClient(transport=transport, base_url="http://test") as client: