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/src/vite-env.d.ts

@@ -1 +1,48 @@
 /// <reference types="vite/client" />
+
+// ===== 浏览器 Speech Recognition API 类型声明 =====
+// Chrome/Edge 使用 window.SpeechRecognition，部分旧版使用 window.webkitSpeechRecognition
+
+interface SpeechRecognitionEvent extends Event {
+  results: SpeechRecognitionResultList;
+  resultIndex: number;
+}
+
+interface SpeechRecognitionResultList {
+  length: number;
+  [index: number]: SpeechRecognitionResult;
+}
+
+interface SpeechRecognitionResult {
+  isFinal: boolean;
+  length: number;
+  [index: number]: SpeechRecognitionAlternative;
+}
+
+interface SpeechRecognitionAlternative {
+  transcript: string;
+  confidence: number;
+}
+
+interface SpeechRecognitionErrorEvent extends Event {
+  error: string;
+  message: string;
+}
+
+interface SpeechRecognition extends EventTarget {
+  continuous: boolean;
+  interimResults: boolean;
+  lang: string;
+  onresult: ((event: SpeechRecognitionEvent) => void) | null;
+  onerror: ((event: SpeechRecognitionErrorEvent) => void) | null;
+  onend: (() => void) | null;
+  onstart: (() => void) | null;
+  start(): void;
+  stop(): void;
+  abort(): void;
+}
+
+interface Window {
+  SpeechRecognition?: new () => SpeechRecognition;
+  webkitSpeechRecognition?: new () => SpeechRecognition;
+}