commit_msg.txt

feat: improve frontend integration, enhance MongoDB connectivity, expand CORS configuration, and fix wallet deposit processing issues

- added full frontend-backend connection support for local development
- expanded CORS middleware configuration for frontend testing environments
- fixed multiple frontend API communication issues and preflight request handling
- improved MongoDB Atlas connection logic and environment configuration
- added better MongoDB timeout and connection error handling
- updated wallet deposit processing flow and transaction validation
- fixed deposit balance synchronization bugs between frontend and backend
- improved API response consistency for frontend integration
- enhanced authentication error handling and JWT validation responses
- fixed frontend request failures caused by invalid headers and blocked origins
- added safer database initialization and fallback connection handling
- improved logging for frontend debugging and backend diagnostics
- optimized error responses for easier frontend state management
- cleaned up backend validation flow for registration and wallet operations
- improved development environment compatibility for React/Next.js frontend