fix: 登录频率限制 bug — lock_until=0 导致计数被清零

根因: 初始 lock_until=0 时 now >= 0 + 60 恒为真, 每次请求都清除计数
修复: lock_until 改用 None 表示未锁定, 仅非 None 时做过期判断

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

config/services/network_routes.yaml

@@ -1,9 +1,17 @@
 http_port: 4200
-last_updated: 316707.287225746
+last_updated: 11552.015952154
 plugin_routes:
   example_plugin:
   - methods:
     - GET
     path: /example_plugin/api/example/info
     require_auth: false
+  - methods:
+    - POST
+    path: /example_plugin/api/plugin/echo
+    require_auth: true
+  - methods:
+    - POST
+    path: /example_plugin/api/plugin/plugin_status
+    require_auth: true
 websocket_port: 4240