Initial project setup: Next.js frontend + .NET 9 backend

- Frontend: Next.js 16 + shadcn/ui + Tailwind CSS 4
- Backend: .NET 9 Web API with Npgsql health check
- Docker Compose for prod and dev environments
- Woodpecker CI pipeline for auto-deploy
- Health check endpoints for E2E testing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/app/page.tsx

@@ -0,0 +1,19 @@
+export default function Home() {
+  return (
+    <div className="flex min-h-screen items-center justify-center">
+      <main className="flex flex-col items-center gap-8 text-center">
+        <h1 className="text-5xl font-bold tracking-tight">GoodBrick</h1>
+        <p className="text-xl text-muted-foreground">
+          Производитель фасадной плитки
+        </p>
+        <div className="flex gap-4 text-sm text-muted-foreground">
+          <span>Next.js</span>
+          <span>+</span>
+          <span>shadcn/ui</span>
+          <span>+</span>
+          <span>.NET 9</span>
+        </div>
+      </main>
+    </div>
+  );
+}