perf(web): 优化静态资源缓存与代码分割

nginx.conf

@@ -23,6 +23,15 @@ server {
     gzip_vary on;
     gzip_types application/json application/javascript text/css text/plain image/svg+xml;
 
+    # Vite assets use content hashes, so they are safe to cache across deployments.
+    # Keep index.html uncached below so it always points to the current asset manifest.
+    location ^~ /assets/ {
+        access_log off;
+        try_files $uri =404;
+        expires 1y;
+        add_header Cache-Control "public, max-age=31536000, immutable" always;
+    }
+
     location ^~ /api/public/canvas-shares/ {
         access_log off;
         proxy_pass http://backend:8080;