- Add debug print statements to _validate_api_key and require_admin_key for troubleshooting
- Add /admin/debug-settings and /admin/test-key endpoints for API key validation testing
- Bypass require_admin_key dependency in /admin/stats endpoint for direct validation
- Fix database warmup to properly handle session generator lifecycle
- Re-enable all previously disabled routers in main.py
- Add custom OpenAPI security scheme
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