fix(deploy): serve standalone client chunks at /_next/static

Next.js standalone output places client chunks under dist/static, but the
generated HTML references /_next/static/... which Nginx serves from
dist/_next/static. Mirror static -> _next/static during build so CSS/JS
load with correct MIME types instead of 404.

scripts/deploy.sh

@@ -144,6 +144,14 @@ cmd_build() {
         log "✅ public 静态资源已同步到 $DIST_DIR"
     fi
 
+    # standalone 构建的客户端静态资源位于 dist/static，而 HTML 引用 /_next/static/...；
+    # 复制到 dist/_next/static 供 Nginx 直接服务
+    if [[ -d "$DIST_DIR/static" ]]; then
+        mkdir -p "$DIST_DIR/_next"
+        cp -R "$DIST_DIR/static" "$DIST_DIR/_next/static"
+        log "✅ _next/static 已从 static 同步到 $DIST_DIR/_next/static"
+    fi
+
     log "✅ 构建完成，产物大小: $(du -sh "$DIST_DIR" | cut -f1)"
 }