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>

.woodpecker/deploy.yml

@@ -0,0 +1,32 @@
+when:
+  branch: [main, dev]
+  event: push
+
+steps:
+  - name: deploy-prod
+    image: appleboy/drone-ssh
+    when:
+      branch: main
+    settings:
+      host: 31.131.18.254
+      username: deploy
+      key:
+        from_secret: ssh_key
+      script:
+        - cd /srv/apps/gb-site && git pull origin main
+        - cd /srv/apps/gb-site/deploy && docker compose -f docker-compose.prod.yml build --no-cache
+        - cd /srv/apps/gb-site/deploy && docker compose -f docker-compose.prod.yml up -d
+
+  - name: deploy-dev
+    image: appleboy/drone-ssh
+    when:
+      branch: dev
+    settings:
+      host: 31.131.18.254
+      username: deploy
+      key:
+        from_secret: ssh_key
+      script:
+        - cd /srv/apps/gb-site && git pull origin dev
+        - cd /srv/apps/gb-site/deploy && docker compose -f docker-compose.dev.yml build --no-cache
+        - cd /srv/apps/gb-site/deploy && docker compose -f docker-compose.dev.yml up -d