feat: enhance face-lock service with improved upload handling and response structure

- Updated README.md to reflect new features and API changes.
- Introduced versioning in app initialization.
- Enhanced configuration management in app/config.py with new validation functions.
- Refactored main.py to improve request handling and response generation.
- Added new models in app/models.py for structured API responses.
- Implemented a dedicated UI rendering function in app/ui.py.
- Improved Docker configuration for better security and health checks.
- Updated tests to cover new validation rules and response formats.
- Added CLAUDE.md for project guidelines and working rules.

.env.example

@@ -1,5 +1,12 @@
-ENV=prod
-FACE_LOCK_TEST_UI=true
+ENV=production
+PORT=8000
+LOG_LEVEL=info
+FACE_LOCK_DOCS=true
+FACE_LOCK_TEST_UI=false
+FACE_LOCK_MAX_UPLOAD_BYTES=8388608
+FACE_LOCK_ALLOWED_MIME_TYPES=image/jpeg,image/png,image/webp,image/gif
+WEB_CONCURRENCY=2
+UVICORN_KEEPALIVE_TIMEOUT=5
 # Optional auth
 # FACE_LOCK_AUTH_TOKEN=change-me
 # FACE_LOCK_AUTH_HEADER=X-API-Key