Phase 2: ProxyService reverse proxy (HTTP+WebSocket forwarding)

- New: services/proxy_service.py (path->URL mapping)
- New: services/web_panel/routes/proxy.py (3 REST endpoints)
- New: static/web_panel/pages/proxy.html (WebUI)
- Tests: 28/28 passing

docs/Phase2_Progress.md

@@ -0,0 +1,13 @@
+# Phase 2 开发进度总结
+
+> 完成: 2026-06-10
+> 测试: 28/28 通过
+
+## 新增
+- `services/proxy_service.py` (160行) — 反向代理 (HTTP+WS转发)
+- `services/web_panel/routes/proxy.py` — 代理管理 API
+- `static/web_panel/pages/proxy.html` — 代理管理 WebUI
+
+## 集成
+- Web panel manager 自动加载 proxy 路由
+- main.py 初始化 ProxyService (step 11.8)