Improve error handling middleware to catch all unhandled errors

[djdiptayan1]

Description:
The current error handling middleware doesn't catch all types of errors, leading to server crashes and poor user experience.

Current Issues:

• Unhandled promise rejections cause server crashes
• Database connection errors not properly handled
• Inconsistent error response formats
• Missing error logging for debugging
• No error recovery mechanisms

What needs to be fixed:

• Add global error handler for unhandled promise rejections
• Standardize error response format across all endpoints
• Add comprehensive error logging
• Implement graceful error recovery
• Add custom error classes for different error types

Acceptance Criteria:

• All errors are caught and handled gracefully
• Consistent error response format across all endpoints
• Error details are logged for debugging
• Server doesn't crash on unhandled errors
• Custom error classes for different scenarios

Files to modify:

• src/middleware/errorMiddleware.js
• src/app.js (for global error handling)

[saura8668]

Hi @djdiptayan1 can you please assign me this issue?