fix(kong): admin-service read/write timeout 60s → 600s

下载 53MB APK 在慢速移动网络下超过 60s，Kong 会断开连接。
改为 600s（10分钟）与 Nginx 保持一致。

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

backend/kong/kong.yml

@@ -60,6 +60,9 @@ services:
   # --- admin-service (NestJS :3012) - App version management ---
   - name: admin-service
     url: http://admin-service:3012
+    read_timeout: 600000   # 10min — large file download/upload
+    write_timeout: 600000
+    connect_timeout: 10000
     routes:
       - name: app-version-routes
         paths: