feat: Fix Docker configuration and update documentation

- Fix nginx port mapping (12000:80) for single port exposure
- Remove backend port exposure (internal network only)
- Fix nginx configuration (remove invalid must-revalidate directive)
- Update README with correct setup instructions
- Update TODO.md with completed tasks and current status
- Application now running on http://localhost:12000 with production build

TODO.md

@@ -1,6 +1,16 @@
 # MerchantsOfHope-SupplyANdDemandPortal - Production Readiness TODO
 
-_Last updated: January 2025_
+_Last updated: October 17, 2025_
+
+## ✅ COMPLETED - Application Running
+- [x] **Docker Configuration**: Fixed nginx port mapping and database authentication
+- [x] **Single Port Exposure**: Only port 12000 exposed (maps to nginx:80 internally)
+- [x] **Production Build**: Using nginx with production React build (no dev/prod drift)
+- [x] **API Proxy**: Backend accessible via `/api/*` routes through nginx
+- [x] **End-to-End Testing**: Application actually tested and working
+- [x] **Documentation**: Updated README with correct setup instructions
+
+**Application Status**: ✅ **RUNNING** at http://localhost:12000
 
 ## 🚨 CRITICAL PRODUCTION BLOCKERS