feat: SPA routing, projects/resume sections, deployment infra

- Add client-side router with History API pushState (router.ts, pages.ts)
- Extend overlay with projects grid/category/detail views and resume section
- Add Gitea CI/CD workflow and webhook deployment server
- Improve Docker Compose with nginx reverse proxy config
- Add deployment script and .env.example

docker-compose.yml

@@ -1,6 +1,17 @@
 services:
   web:
-    build: .
-    ports:
-      - "8080:80"
+    build:
+      context: .
+      dockerfile: Dockerfile
+    image: webgpu-portfolio:latest
+    container_name: webgpu-portfolio-web
     restart: unless-stopped
+    ports:
+      # Loopback only — system nginx proxies from :443 → :8080
+      - "127.0.0.1:8080:8080"
+    healthcheck:
+      test: ["CMD-SHELL", "curl -sf http://127.0.0.1:8080/ || exit 1"]
+      interval: 15s
+      timeout: 5s
+      retries: 3
+      start_period: 5s