chore: 清空 v2 实现，重建新架构骨架（人格化通用 Agent 运行时）

frontend/web/public/manifest.json

@@ -1,12 +0,0 @@
-{
-  "name": "Cyrene",
-  "short_name": "Cyrene",
-  "description": "LLM-powered AI companion platform",
-  "start_url": "/",
-  "display": "standalone",
-  "background_color": "#242424",
-  "theme_color": "#3482FF",
-  "icons": [
-    { "src": "/images/cyrene-avatar.png", "sizes": "512x512", "type": "image/png" }
-  ]
-}

frontend/web/public/sw.js

@@ -1,6 +0,0 @@
-// Cyrene PWA Service Worker
-const CACHE = 'cyrene-v2'
-const URLS = ['/', '/index.html', '/images/cyrene-avatar.png']
-
-self.addEventListener('install', e => e.waitUntil(caches.open(CACHE).then(c => c.addAll(URLS))))
-self.addEventListener('fetch', e => e.respondWith(caches.match(e.request).then(r => r || fetch(e.request))))