chore(docker): add containerized deployment and nginx proxy

docker/nginx.conf

@@ -0,0 +1,38 @@
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # Static files with long cache
+    location ~* \.(?:js|css|woff2?|svg|png|jpg|jpeg|gif|webp|ico)$ {
+        expires 7d;
+        add_header Cache-Control "public";
+        try_files $uri =404;
+    }
+
+    # API proxy
+    location /api/ {
+        proxy_pass http://backend:3000/api/;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_set_header Connection "";
+        client_max_body_size 10m;
+    }
+
+    # Uploaded files (images)
+    location /uploads/ {
+        proxy_pass http://backend:3000/uploads/;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_cache_valid 200 1h;
+    }
+
+    # SPA fallback
+    location / {
+        try_files $uri /index.html;
+    }
+}