feat(frontend): M9 模态 UI（mode 系统+共享 store+WS 客户端 + chat(思维链/工具回显/情绪徽标)/code/Agent 监控/后台思考页 + Miuix 设计 token + PWA）；tsc+vite build 通过

frontend/web/public/manifest.json

@@ -0,0 +1,18 @@
+{
+  "name": "Cyrene · 昔涟",
+  "short_name": "Cyrene",
+  "description": "Cyrene v2 用户前端（M9 模态 UI）",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#0c0c0c",
+  "theme_color": "#161616",
+  "orientation": "any",
+  "icons": [
+    {
+      "src": "/icon.svg",
+      "type": "image/svg+xml",
+      "sizes": "any",
+      "purpose": "any maskable"
+    }
+  ]
+}