fix: add nginx /uploads/ proxy for cover images

deploy/README.md

@@ -73,6 +73,13 @@ location /assets/ {
     expires 30d;
     add_header Cache-Control "public, immutable";
 }
+
+# 上传文件（后端存储的封面图等）
+location /uploads/ {
+    proxy_pass http://127.0.0.1:30081/uploads/;
+    proxy_set_header Host $host;
+    proxy_set_header X-Real-IP $remote_addr;
+}
 ```
 
 ## 域名访问