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

services/web_panel/routes/proxy.py

@@ -0,0 +1,30 @@
+from aiohttp import web, ClientSession
+import json, logging, asyncio
+logger = logging.getLogger(__name__)
+
+def setup_proxy_routes(app, service_manager):
+    async def list_proxies(request):
+        ps = service_manager.get_service("proxy")
+        return web.json_response({"proxies": ps.list_proxies() if ps else []})
+
+    async def add_proxy(request):
+        try:
+            data = await request.json()
+            ps = service_manager.get_service("proxy")
+            ok = await ps.register_proxy(
+                path=data.get("path",""), target_url=data.get("target",""),
+                description=data.get("description",""), is_external=data.get("external",False))
+            return web.json_response({"ok": ok})
+        except Exception as e:
+            return web.json_response({"ok": False, "error": str(e)}, status=400)
+
+    async def remove_proxy(request):
+        path = request.match_info.get("path","")
+        ps = service_manager.get_service("proxy")
+        ps.unregister_proxy(path)
+        return web.json_response({"ok": True})
+
+    app.router.add_get("/api/proxy", list_proxies)
+    app.router.add_post("/api/proxy", add_proxy)
+    app.router.add_delete("/api/proxy/{path}", remove_proxy)
+    logger.info("🔀 代理路由已注册")