feat(prod): production deployment fixes - env loader, mongoose module, CSS static files, security hardening, PDF export, new UI components

backend/db/mongoose.js

@@ -5,7 +5,8 @@
 
 const mongoose = require('mongoose');
 const path = require('path');
-require('dotenv').config({ path: path.join(__dirname, '../../.env.local') });
+const envFile = process.env.NODE_ENV === 'production' ? '.env.production' : '.env.local';
+require('dotenv').config({ path: path.join(__dirname, '../../', envFile) });
 
 const MONGODB_URI = process.env.MONGODB_URI || 'mongodb://127.0.0.1:27017/backone_dpi';