fix: CORS configuration and update all README files

- Fixed dotenv path in app.js to properly load .env from backend root
- Updated CORS to allow http://localhost:5173 (frontend URL)
- Updated README.md with accurate project statistics (58 files, 6677+ lines)
- Updated backend/README.md - marked as Production Ready
- Updated frontend/README.md with complete feature list
- All systems tested and working (backend + frontend)

backend/src/app.js

@@ -1,4 +1,4 @@
-require('dotenv').config();
+require('dotenv').config({ path: require('path').join(__dirname, '../.env') });
 const express = require('express');
 const session = require('express-session');
 const helmet = require('helmet');