feat: 第五轮开发 - 14项未来路线图功能完整实现

W1-W14 全部完成:
- W1: 消息搜索 (ILIKE全文检索 + SearchModal)
- W2: 对话导出 (JSON/Markdown/TXT三格式)
- W3: 记忆时间线 DevTools 可视化
- W4: 通知推送系统 (WebSocket + Browser Notification API)
- W5: 定时提醒 (30s轮询 + 重复提醒 + WebSocket推送)
- W6: 每日简报 (08:00自动生成: 天气+新闻+提醒+AI摘要)
- W7: IoT场景自动化 (规则引擎 10s轮询 + 条件评估 + 场景执行)
- W8: 语音输入 (浏览器 Speech Recognition API)
- W9: STT服务 (voice-service + whisper.cpp)
- W10: TTS服务 (浏览器 Speech Synthesis + edge-tts三档回退)
- W11: 文件管理 (上传/下载/缩略图/纯Go bilinear缩放)
- W12: 知识库RAG (PostgreSQL tsvector + 文档分块 + 检索)
- W13: 多模态 (图片上传+分析: Vision API + 本地Go分析回退)
- W14: PWA (Service Worker + 离线页 + install prompt)

总计: 6个Go微服务 + 10+前端组件 + 10+ PostgreSQL表 + 4个后台调度器

frontend/web/public/manifest.json

@@ -0,0 +1,39 @@
+{
+  "name": "Cyrene - AI 智能助手",
+  "short_name": "Cyrene",
+  "description": "你的 AI 生活伴侣，支持 IoT 控制、知识库、语音交互",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#fdf2f8",
+  "theme_color": "#ec4899",
+  "orientation": "any",
+  "icons": [
+    {
+      "src": "/images/Cyrene_Avatar/2nd_Form/Cyrene-2F-N-Happy-1.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any maskable"
+    }
+  ],
+  "categories": ["productivity", "utilities"],
+  "lang": "zh-CN",
+  "dir": "ltr",
+  "scope": "/",
+  "prefer_related_applications": false,
+  "shortcuts": [
+    {
+      "name": "新对话",
+      "url": "/#/new",
+      "description": "开始新对话"
+    }
+  ],
+  "share_target": {
+    "action": "/#/share",
+    "method": "GET",
+    "params": {
+      "title": "title",
+      "text": "text",
+      "url": "url"
+    }
+  }
+}