feat: Add WonderQ-MiniAPP Public API documentation

- Introduced a comprehensive API contract for the WonderQ-MiniAPP, detailing endpoints for site configuration, product listings, and lead submissions.
- Defined data types for various entities including HeroSlide, Destination, Theme, CtaBanner, PublicProduct, and more.
- Specified request and response formats, including error handling guidelines.

chore: Update requirements to include python-multipart

- Added python-multipart dependency to requirements.txt for handling file uploads.

test: Implement API contract tests

- Created test suite for API contracts, validating serializers and endpoints for public products and leads.
- Included tests for destination and product serializers, ensuring correct data handling and validation.

test: Add configuration tests for OSS settings

- Implemented tests to verify that OSS settings are correctly loaded from environment variables.

app/main.py

@@ -28,6 +28,8 @@ def create_app() -> FastAPI:
 
     @app.exception_handler(HTTPException)
     async def http_exception_handler(_request: Request, exc: HTTPException):
+        if isinstance(exc.detail, dict) and "message" in exc.detail:
+            return JSONResponse(status_code=exc.status_code, content=exc.detail)
         return JSONResponse(status_code=exc.status_code, content={"message": exc.detail})
 
     @app.exception_handler(Exception)