chore: Projektgeruest mit Next.js, TypeScript und Tailwind

Grundgeruest der Anwendung: Next.js 15 (App Router), TypeScript im
strict-Modus, Tailwind mit shadcn/ui-Farbtokens.

Bewusste Festlegungen:
- Nur Systemschriften, keine externen Fonts, kein CDN.
- Grundschrift eine Stufe groesser, Fokusring immer sichtbar,
  Touchziele mindestens 44px.
- Ampelfarben fuer Fristen als eigene Design-Tokens.
- Betraege werden als Cent-Ganzzahl gefuehrt, damit die Rechnungslegung
  keine Rundungsfehler erbt.
- .env.example dokumentiert alle Geheimnisse; npm run schluessel erzeugt sie.

Etappe: 1
Phase: Fundament

package.json

@@ -0,0 +1,66 @@
+{
+  "name": "betreuungs-cockpit",
+  "version": "0.1.0",
+  "private": true,
+  "description": "Arbeits- und Dokumentationswerkzeug fuer die ehrenamtliche rechtliche Betreuung",
+  "engines": {
+    "node": ">=20.11"
+  },
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build",
+    "start": "next start",
+    "lint": "next lint",
+    "typecheck": "tsc --noEmit",
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "db:generate": "prisma generate",
+    "db:migrate": "prisma migrate dev",
+    "db:deploy": "prisma migrate deploy",
+    "db:volltext": "prisma db execute --schema prisma/schema.prisma --file prisma/sql/volltextsuche.sql",
+    "db:seed": "prisma db seed",
+    "db:studio": "prisma studio",
+    "setup": "prisma migrate deploy && npm run db:volltext && npm run db:seed",
+    "schluessel": "node scripts/schluessel-erzeugen.mjs",
+    "postinstall": "prisma generate"
+  },
+  "prisma": {
+    "seed": "tsx prisma/seed.ts"
+  },
+  "dependencies": {
+    "@node-rs/argon2": "2.0.2",
+    "@prisma/client": "6.3.1",
+    "@radix-ui/react-dialog": "1.1.4",
+    "@radix-ui/react-dropdown-menu": "2.1.4",
+    "@radix-ui/react-label": "2.1.1",
+    "@radix-ui/react-slot": "1.1.1",
+    "class-variance-authority": "0.7.1",
+    "clsx": "2.1.1",
+    "date-fns": "4.1.0",
+    "lucide-react": "0.474.0",
+    "next": "15.1.6",
+    "next-auth": "5.0.0-beta.25",
+    "otpauth": "9.3.6",
+    "qrcode": "1.5.4",
+    "react": "19.0.0",
+    "react-dom": "19.0.0",
+    "tailwind-merge": "2.6.0",
+    "tailwindcss-animate": "1.0.7",
+    "zod": "3.24.1"
+  },
+  "devDependencies": {
+    "@types/node": "22.13.1",
+    "@types/qrcode": "1.5.5",
+    "@types/react": "19.0.8",
+    "@types/react-dom": "19.0.3",
+    "autoprefixer": "10.4.20",
+    "eslint": "9.19.0",
+    "eslint-config-next": "15.1.6",
+    "postcss": "8.5.1",
+    "prisma": "6.3.1",
+    "tailwindcss": "3.4.17",
+    "tsx": "4.19.2",
+    "typescript": "5.7.3",
+    "vitest": "3.0.5"
+  }
+}