fix(nginx): 移除 /admin/assets/ rewrite 块，避免变量 proxy_pass 返回 500

Made-with: Cursor

nginx/yuheng.docker.conf.tpl

@@ -26,18 +26,7 @@ server {
         add_header Cache-Control "no-store";
     }
 
-    # ^~ 优先于 location /：strip /admin 后反代（rewrite+break 与变量 upstream 兼容，避免误走 web）
-    location ^~ /admin/assets/ {
-        rewrite ^/admin/(.*)$ /$1 break;
-        set $upstream_admin admin;
-        proxy_pass http://$upstream_admin:80;
-        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;
-    }
-
+    # /admin/ 由下方 location 处理；勿再单独 rewrite /admin/assets（rewrite+变量 proxy_pass 易 500）
     location / {
         set $upstream_web web;
         proxy_pass http://$upstream_web:80;