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

nginx.default.conf

@@ -1,5 +1,5 @@
 server {
-    listen 80;
+    listen 8080 default_server;
     server_name _;
 
     root /usr/share/nginx/html;