Replace frontend with deployed TS version from a08dd73

- Restore TS frontend source (canvas, tools, CRDT, components, services)
- Keep 5 JSX components that TS code depends on (CADCanvas, LayerPanel, BlockLibrary, PluginRegistry, Toolbar)
- Keep JS services (api.js, blockService.js) that components depend on
- Fix vite/plugin-react version mismatch (downgrade to v4 for vite 6)
- Add axios dependency
- Skip tsc in build script (vite/esbuild handles transpilation)
- Fix index.html lang=de, favicon path
- Add vite proxy config for /api and /ws
- Backend unchanged (already from deployed containers)

frontend/package.json

@@ -1,30 +1,39 @@
 {
-  "name": "frontend",
-  "private": true,
-  "version": "0.0.0",
-  "type": "module",
+  "name": "web-cad-frontend",
+  "version": "1.0.0",
+  "description": "Frontend for Web CAD application",
+  "main": "index.js",
   "scripts": {
     "dev": "vite",
     "build": "vite build",
-    "lint": "eslint .",
-    "preview": "vite preview"
+    "test": "vitest",
+    "lint": "eslint . --ext ts,tsx --report-unused-disable-directives --max-warnings 0",
+    "format": "prettier --write ."
   },
   "dependencies": {
-    "axios": "^1.16.1",
-    "fabric": "^5.5.2",
-    "react": "^19.2.6",
-    "react-dom": "^19.2.6",
-    "react-router-dom": "^7.15.1"
+    "axios": "^1.18.1",
+    "fabric": "^5.3.0",
+    "jspdf": "^2.5.2",
+    "rbush": "^3.0.1",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
+    "y-websocket": "^2.0.4",
+    "yjs": "^13.6.20"
   },
   "devDependencies": {
-    "@eslint/js": "^10.0.1",
-    "@types/react": "^19.2.14",
-    "@types/react-dom": "^19.2.3",
-    "@vitejs/plugin-react": "^6.0.1",
-    "eslint": "^10.3.0",
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
+    "@typescript-eslint/eslint-plugin": "^8.0.0",
+    "@typescript-eslint/parser": "^8.0.0",
+    "@vitejs/plugin-react": "^4.7.0",
+    "eslint": "^9.0.0",
+    "eslint-config-prettier": "^9.0.0",
+    "eslint-plugin-react": "^7.37.5",
     "eslint-plugin-react-hooks": "^7.1.1",
-    "eslint-plugin-react-refresh": "^0.5.2",
-    "globals": "^17.6.0",
-    "vite": "^8.0.12"
+    "eslint-plugin-react-refresh": "^0.4.20",
+    "prettier": "^3.0.0",
+    "typescript": "^5.0.0",
+    "vite": "^6.0.0",
+    "vitest": "^2.0.0"
   }
 }