chore: projekt-scaffold mit next 15, tailwind und shadcn/ui

Next.js 15 (App Router, TypeScript strict), Tailwind CSS 4 und
shadcn/ui als Basis. Standalone-Output und serverExternalPackages
sind fuer den spaeteren Docker-Build vorbereitet.

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

next.config.ts

@@ -0,0 +1,17 @@
+import type { NextConfig } from 'next';
+
+const nextConfig: NextConfig = {
+  // Standalone output keeps the Docker runtime image small (no node_modules copy).
+  output: 'standalone',
+  // Native modules must not be bundled by the server compiler.
+  serverExternalPackages: ['better-sqlite3', 'sharp'],
+  // All images are either local files served by /api/files or URLs the user
+  // entered themselves. We never let the optimizer fetch arbitrary remote hosts.
+  images: { unoptimized: true },
+  eslint: {
+    // Linting runs as its own step (`pnpm lint`), not as part of the build.
+    ignoreDuringBuilds: true,
+  },
+};
+
+export default nextConfig;