fix: 7 Bugs behoben – Backend+Frontend lauffähig getestet

Backend-Fixes:
- vehicles-Relation in Account-Model ergänzt (500er bei Auth)
- security.py: bcrypt direkt statt passlib (bcrypt 5.x-Kompatibilität)
- auth.py Login: selectinload(User.role) gegen Lazy-Loading-500er
- equipment_group.py: LocationRef-Import via TYPE_CHECKING

Frontend-Fixes:
- api.ts: Python-Docstring durch JS-Kommentar ersetzt
- AppLayout.tsx: AddressBook→Contact (existiert nicht in lucide-react)
- package.json: axios-Dependency ergänzt

Tests bestanden:
- Health 200, Register 201, Login 200, Projects CRUD 200, alle API-Listen 200
- tsc --noEmit: sauber, vite build: erfolgreich

frontend/package.json

@@ -10,34 +10,35 @@
     "lint": "eslint ."
   },
   "dependencies": {
-    "react": "^19.1.0",
-    "react-dom": "^19.1.0",
-    "react-router-dom": "^7.5.0",
-    "zustand": "^5.0.3",
-    "@tanstack/react-query": "^5.75.5",
-    "@radix-ui/react-slot": "^1.2.0",
     "@radix-ui/react-dialog": "^1.1.0",
     "@radix-ui/react-dropdown-menu": "^2.1.0",
     "@radix-ui/react-label": "^2.1.0",
     "@radix-ui/react-separator": "^1.1.0",
+    "@radix-ui/react-slot": "^1.2.0",
+    "@tanstack/react-query": "^5.75.5",
+    "axios": "^1.16.1",
     "class-variance-authority": "^0.7.0",
     "clsx": "^2.1.1",
+    "lucide-react": "^0.515.0",
+    "react": "^19.1.0",
+    "react-dom": "^19.1.0",
+    "react-router-dom": "^7.5.0",
     "tailwind-merge": "^3.2.0",
-    "lucide-react": "^0.515.0"
+    "zustand": "^5.0.3"
   },
   "devDependencies": {
+    "@eslint/js": "^9.25.0",
+    "@tailwindcss/vite": "^4.1.0",
     "@types/react": "^19.1.0",
     "@types/react-dom": "^19.1.0",
     "@vitejs/plugin-react": "^4.4.1",
-    "typescript": "~5.8.0",
-    "vite": "^6.3.0",
-    "tailwindcss": "^4.1.0",
-    "@tailwindcss/vite": "^4.1.0",
-    "@eslint/js": "^9.25.0",
     "eslint": "^9.25.0",
     "eslint-plugin-react-hooks": "^5.2.0",
     "eslint-plugin-react-refresh": "^0.4.0",
     "globals": "^16.0.0",
-    "typescript-eslint": "^8.30.0"
+    "tailwindcss": "^4.1.0",
+    "typescript": "~5.8.0",
+    "typescript-eslint": "^8.30.0",
+    "vite": "^6.3.0"
   }
 }