feat: add Vite host and Gitea CI for project57 embed

nginx.conf

@@ -0,0 +1,16 @@
+server {
+  listen 3000;
+  server_name _;
+  root /usr/share/nginx/html;
+  index index.html;
+
+  location = /api/health {
+    default_type text/plain;
+    add_header Content-Type text/plain;
+    return 200 "ok";
+  }
+
+  location / {
+    try_files $uri $uri/ /index.html;
+  }
+}