Enhance backend and frontend setup with MySQL integration, Docker configurations, and toast notifications

- Updated .gitignore to include additional environment and build files
- Configured Dockerfiles for backend and frontend with npm install and port exposure
- Added MySQL connection pool and query function in backend services
- Implemented form submission with toast notifications in MainForm component
- Updated package.json and package-lock.json for new dependencies
- Enhanced routing and layout in frontend with toast notifications

frontend/package.json

@@ -15,6 +15,7 @@
     "react": "^19.1.1",
     "react-dom": "^19.1.1",
     "react-router-dom": "^7.8.0",
+    "react-toastify": "^11.0.5",
     "tailwind-merge": "^3.3.1",
     "tailwindcss": "^4.1.11",
     "tailwindcss-animate": "^1.0.7",