fix: resolve test failures and remove unavailable dependency

- Remove gitea-mcp-server from dependencies (not yet on PyPI)
- Add starlette to dependencies (needed for middleware)
- Fix HealthCheckBypassMiddleware to actually bypass auth via request.state flag
- Fix test_required_fields to not require gitea_repo (optional for PMO mode)
- Update pytest testpaths to correct location

All 30 tests now pass.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

requirements.txt

@@ -1,9 +1,11 @@
 # HTTP Transport Wrapper Dependencies
 mcp>=0.9.0
 uvicorn>=0.27.0
+starlette>=0.36.0
 pydantic>=2.0.0
 pydantic-settings>=2.0.0
 python-dotenv>=1.0.0
 
 # Official Gitea MCP Server (to be wrapped)
-gitea-mcp-server>=0.1.0
+# Install separately - not on PyPI yet
+# See: https://gitea.hotserv.cloud/personal-projects/leo-claude-mktplace