chore(deploy): 简化 nginx 路由 + 自动部署 nginx config + 删除 .github workflows

- nginx: /app/ → Flutter，/ 兜底 → 营销站，移除零散 location 块
- deploy.yml: 每次部署自动 scp nginx-jiu.conf 到服务器并 nginx -t reload
- deploy.yml: Release 附件新增 configs.tar.gz（nginx/systemd/compose 配置）
- 删除 .github/workflows/（已全部迁移到 .gitea/）

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

deploy/nginx-jiu.conf

@@ -22,44 +22,23 @@ server {
         proxy_read_timeout 30s;
     }
 
-    # Flutter 管理端（/app/ 子路径）
+    # Flutter 管理端（仅 /app/ 前缀，不污染根路径）
     location /app/ {
         alias /opt/jiu/web/;
         index index.html;
         try_files $uri $uri/ /app/index.html;
     }
 
-    # Flutter 公开商品扫码页（/product/:id → Flutter app）
-    location /product/ {
-        alias /opt/jiu/web/;
-        try_files $uri /app/index.html;
-    }
-
-    # 营销站点 — 精确路径
-    location = / {
-        root /opt/jiu/marketing;
-        try_files /index.html =404;
-    }
-    location ~ ^/(docs|download)(\.html)?$ {
-        root /opt/jiu/marketing;
-        try_files /$1.html =404;
-    }
-    location /features/ {
-        root /opt/jiu/marketing;
-        try_files $uri $uri.html =404;
-    }
-
-    # 营销站点 — 扫码 HTML 页（保留旧链接兼容）
+    # 扫码页（/scan/<id> → scan.html，JS 从 URL 读取 id）
     location /scan/ {
         root /opt/jiu/marketing;
         try_files /scan.html =404;
     }
 
-    # 营销静态资源（CSS / SVG / 图片等）
-    location /assets/ {
+    # 营销站点兜底（根路径及所有其他路径）
+    location / {
         root /opt/jiu/marketing;
-        expires 7d;
-        add_header Cache-Control "public";
+        try_files $uri $uri.html $uri/index.html /index.html;
     }
 }