refactor: migrate from MUI to Ant Design for layout and components

- Updated package.json to remove MUI dependencies and add Ant Design.
- Refactored App component to use Ant Design's Layout, Header, Footer, and Sidebar.
- Created new Footer, Header, and Sidebar components using Ant Design.
- Removed old Header component that used MUI.
- Updated Home component to use Ant Design's Typography and Button.
- Added global styles in index.less and theme styles in theme.less and layout.less.
- Removed MUI theme configuration and replaced it with Ant Design's theming.

frontend/package.json

@@ -8,14 +8,12 @@
     "build": "vite build",
     "lint": "eslint .",
     "preview": "vite preview",
-    "dev-local": "cross-env VITE_BACKEND_URL=http://localhost:8000/api vite",
-    "dev-server": "cross-env VITE_BACKEND_URL=http://mitm.lan/api vite"
+    "dev-local": "cross-env VITE_BACKEND_URL=http://localhost:8000/api vite --mode development",
+    "dev-server": "cross-env VITE_BACKEND_URL=http://mitm.lan/api vite --mode development"
   },
   "dependencies": {
-    "@emotion/react": "^11.14.0",
-    "@emotion/styled": "^11.14.1",
-    "@mui/icons-material": "^7.3.4",
-    "@mui/material": "^7.3.4",
+    "@ant-design/icons": "^6.1.0",
+    "antd": "^6.0.0",
     "react": "^19.1.1",
     "react-dom": "^19.1.1",
     "react-router-dom": "^7.9.4"
@@ -28,10 +26,15 @@
     "@types/react-router-dom": "^5.3.3",
     "@vitejs/plugin-react": "^5.0.4",
     "cross-env": "^10.1.0",
-    "eslint": "^9.36.0",
+    "eslint": "^9.39.1",
+    "eslint-config-prettier": "^10.1.8",
+    "eslint-plugin-import": "^2.32.0",
     "eslint-plugin-react-hooks": "^5.2.0",
     "eslint-plugin-react-refresh": "^0.4.22",
     "globals": "^16.4.0",
+    "less": "^4.4.2",
+    "less-loader": "^12.3.0",
+    "prettier": "^3.6.2",
     "typescript": "^5.9.3",
     "vite": "^7.1.12"
   }