chore(api-gateway): 提升速率限制100倍

- minute: 100 → 10000
- hour: 5000 → 500000

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/api-gateway/kong.yml

@@ -307,8 +307,8 @@ plugins:
   # 请求限流
   - name: rate-limiting
     config:
-      minute: 100
+      minute: 10000
-      hour: 5000
+      hour: 500000
       policy: local
 
   # 请求日志