chore: Projektgerüst und Werkzeugkette einrichten

Next 16 mit App Router und standalone-Ausgabe, React 19, TypeScript strict,
Tailwind 4, Vitest und Playwright. Alle Versionen exakt gepinnt.

Abweichungen vom ursprünglich notierten Stand, jeweils begründet:
- Prisma 7.10.0 statt 6, weil 6 überholt ist und 8 nur als RC vorliegt.
- TypeScript 6.0.3 statt 7, weil typescript-eslint 8 nur "<6.1.0" trägt.
- ESLint 9.39.5 statt 10, weil das in eslint-config-next gebündelte
  eslint-plugin-react noch context.getFilename() benutzt.
- npm-overrides für SimpleWebAuthn und nodemailer, weil next-auth dort
  ältere optionale Peers deklariert. Die betroffenen next-auth-Provider
  werden nicht benutzt: Passkeys laufen direkt über SimpleWebAuthn 14.

"npm run pruefen" bündelt Prettier, ESLint, tsc, Vitest und ShellCheck.
ShellCheck läuft über das Docker-Abbild, wenn es lokal fehlt.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

package.json

@@ -0,0 +1,101 @@
+{
+  "name": "planer",
+  "version": "0.0.0",
+  "private": true,
+  "description": "Aufgaben, Ideen, Projekte und Zeitblöcke mit Anbindung an Microsoft 365 und Google Kalender",
+  "type": "module",
+  "engines": {
+    "node": ">=22.12.0"
+  },
+  "scripts": {
+    "dev": "next dev",
+    "build": "prisma generate && next build",
+    "start": "next start",
+    "pruefen": "node scripts/pruefen.mjs",
+    "format": "prettier --write .",
+    "format:pruefen": "prettier --check .",
+    "lint": "eslint . --max-warnings 0",
+    "typen": "tsc --noEmit",
+    "test": "vitest run",
+    "test:beobachten": "vitest",
+    "test:integration": "tsx scripts/integrationstest.ts",
+    "test:migration": "tsx scripts/migrationstest.ts",
+    "test:e2e": "playwright test",
+    "screenshots": "tsx scripts/screenshots.ts",
+    "db:generieren": "prisma generate",
+    "db:migrieren": "prisma migrate dev",
+    "db:einspielen": "prisma migrate deploy",
+    "db:seed": "tsx prisma/seed.ts",
+    "db:studio": "prisma studio"
+  },
+  "prisma": {
+    "seed": "tsx prisma/seed.ts"
+  },
+  "overrides": {
+    "@simplewebauthn/browser": "14.0.0",
+    "@simplewebauthn/server": "14.0.1",
+    "nodemailer": "10.0.3"
+  },
+  "dependencies": {
+    "@auth/prisma-adapter": "2.11.3",
+    "@date-fns/tz": "1.5.0",
+    "@prisma/adapter-pg": "7.10.0",
+    "@prisma/client": "7.10.0",
+    "@radix-ui/react-avatar": "1.2.6",
+    "@radix-ui/react-dialog": "1.1.23",
+    "@radix-ui/react-dropdown-menu": "2.1.24",
+    "@radix-ui/react-label": "2.1.15",
+    "@radix-ui/react-separator": "1.1.15",
+    "@radix-ui/react-slot": "1.3.3",
+    "@simplewebauthn/browser": "14.0.0",
+    "@simplewebauthn/server": "14.0.1",
+    "bcryptjs": "3.0.3",
+    "class-variance-authority": "0.7.1",
+    "clsx": "2.1.1",
+    "date-fns": "4.4.0",
+    "lucide-react": "1.44.0",
+    "next": "16.3.4",
+    "next-auth": "5.0.0-beta.32",
+    "next-themes": "0.4.6",
+    "node-cron": "4.6.0",
+    "nodemailer": "10.0.3",
+    "pg": "8.23.0",
+    "react": "19.3.0",
+    "react-dom": "19.3.0",
+    "server-only": "0.0.1",
+    "sonner": "2.0.8",
+    "tailwind-merge": "3.6.0",
+    "zod": "4.6.1"
+  },
+  "devDependencies": {
+    "@playwright/test": "1.63.0",
+    "@tailwindcss/postcss": "4.3.3",
+    "@testing-library/react": "16.3.3",
+    "@types/node": "24.13.4",
+    "@types/nodemailer": "8.0.1",
+    "@types/pg": "8.23.1",
+    "@types/react": "19.3.0",
+    "@types/react-dom": "19.3.0",
+    "@vitejs/plugin-react": "6.1.1",
+    "@vitest/coverage-v8": "5.0.0",
+    "dotenv": "17.4.2",
+    "eslint": "9.39.5",
+    "eslint-config-next": "16.3.4",
+    "jsdom": "30.0.1",
+    "prettier": "3.9.6",
+    "prettier-plugin-tailwindcss": "0.8.1",
+    "prisma": "7.10.0",
+    "tailwindcss": "4.3.3",
+    "tsx": "4.23.13",
+    "tw-animate-css": "1.4.0",
+    "typescript": "6.0.3",
+    "typescript-eslint": "8.70.0",
+    "vitest": "5.0.0"
+  },
+  "allowScripts": {
+    "prisma@7.10.0": true,
+    "@prisma/engines@7.10.0": true,
+    "esbuild@0.28.2": true,
+    "unrs-resolver@1.12.2": true
+  }
+}