React-Frontend: Grundgerüst (Vite, TypeScript, Router, TanStack Query)

- frontend/ mit Vite 8, React 19, React Router 8, TanStack Query 5, TS 7
- api.ts: Fehler allein über HTTP-Status (ApiError), errMsg wie bisher
- types.ts: API-Antworten laut notes/api.md
- Layout mit unverändertem Header-Markup, app.css als Kopie
- Dev-Proxy für /api und /static aufs Go-Backend
- Containerfile: HEALTHCHECK auf /api/stats

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TiXsPUqw7oeomZ8wZrQW5q

frontend/package.json

@@ -0,0 +1,24 @@
+{
+  "name": "kver-frontend",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc && vite build",
+    "typecheck": "tsc"
+  },
+  "dependencies": {
+    "@tanstack/react-query": "^5.104.0",
+    "react": "^19.3.0",
+    "react-dom": "^19.3.0",
+    "react-router": "^8.4.0"
+  },
+  "devDependencies": {
+    "@types/node": "^26.6.3",
+    "@types/react": "^19.3.0",
+    "@types/react-dom": "^19.3.0",
+    "@vitejs/plugin-react": "^6.1.1",
+    "typescript": "^7.0.2",
+    "vite": "^8.3.1"
+  }
+}