feat(deploy): 挂载 web/public 与 web/promotion 到 yh_web，支持热更新无需重建 dist

Made-with: Cursor

deploy/web/default.conf

@@ -17,7 +17,18 @@ server {
     add_header Cache-Control "public, immutable";
   }
 
+  # web/public 挂载到 /var/www/yh-public：与 dist 根目录同 URL（如 /logo.png），优先读挂载，无则回退 dist
+  location ~ ^/([^/]+\.(?:png|jpe?g|gif|ico|svg|webp|webmanifest))$ {
+    root /var/www/yh-public;
+    try_files /$1 @dist_root_public;
+  }
+  location @dist_root_public {
+    root /usr/share/nginx/html;
+    try_files $uri =404;
+  }
+
   # 推广素材：文件必须真实存在，禁止落到 SPA index.html（否则前端误判「静态存在」、视频拿到 HTML）
+  # 宿主机 ./web/promotion 挂载覆盖本路径，改 social 下文件无需重新 npm build
   location ^~ /promotion/ {
     try_files $uri =404;
     add_header Cache-Control "public, max-age=86400";