feat: 语音流式输入管线 + VAD前端集成 + 插件-工具合并清理

- 前端: VAD语音检测(@ricky0123/vad-web) + useVoiceInput双模式(流式WS/REST)
- Gateway: VoiceStreamManager代理WS流式STT到voice-service
- Voice-service: DashScope REST → Realtime WS → Whisper三级引擎 + ffmpeg转码
- 共享模块: pkg/audio(音频转换) + pkg/dashscope(ASR REST客户端)
- 清理: 移除旧plugin-manager和pkg/plugins，完成插件→工具合并
- 文档: 完善gateway-api.md和voice-service.md语音API文档
- 工具: scripts/voice/ 语音转换脚本集

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/web/src/App.tsx

@@ -36,7 +36,7 @@ function setHashSessionId(sessionId: string | null) {
 
 export default function App() {
   const { isLoggedIn, login, register, loading: authLoading, userId } = useAuth();
-  const { send } = useChat();
+  const { send, sendVoiceStreamMessage } = useChat();
   const { loadSessionsFromServer, ensureMainSession, setCurrentSessionId, setMessages, loadMessagesFromServer, sessions, currentSessionId } = useSessionStore();
 
   const [authMode, setAuthMode] = useState<'login' | 'register'>('login');
@@ -330,41 +330,42 @@ export default function App() {
   return (
     <ErrorBoundary>
       <AppLayout>
-        <PageRouter onSend={send} />
+        <PageRouter onSend={send} onSendVoiceStream={sendVoiceStreamMessage} />
       </AppLayout>
     </ErrorBoundary>
   );
 }
 
 type SendFn = (content: string, mode?: import('@/types/chat').ChatMode, attachments?: import('@/types/chat').MessageAttachment[]) => void;
+type SendVoiceStreamFn = (msg: import('@/types/chat').WSClientMessage) => void;
 
-function PageRouter({ onSend }: { onSend: SendFn }) {
+function PageRouter({ onSend, onSendVoiceStream }: { onSend: SendFn; onSendVoiceStream: SendVoiceStreamFn }) {
   const currentPage = usePageStore((s) => s.currentPage);
   const isAdmin = isAdminUser(localStorage.getItem('user_id') || '');
 
   switch (currentPage) {
     case 'admin-models':
-      if (!isAdmin) return <ChatPage onSend={onSend} />;
+      if (!isAdmin) return <ChatPage onSend={onSend} onSendVoiceStream={onSendVoiceStream} />;
       return <ModelsAdminPage />;
     case 'admin-dashboard':
-      if (!isAdmin) return <ChatPage onSend={onSend} />;
+      if (!isAdmin) return <ChatPage onSend={onSend} onSendVoiceStream={onSendVoiceStream} />;
       return <AdminDashboard />;
     case 'profile':
       return <ProfilePage />;
     case 'chat':
     default:
-      return <ChatPage onSend={onSend} />;
+      return <ChatPage onSend={onSend} onSendVoiceStream={onSendVoiceStream} />;
   }
 }
 
-function ChatPage({ onSend }: { onSend: SendFn }) {
+function ChatPage({ onSend, onSendVoiceStream }: { onSend: SendFn; onSendVoiceStream: SendVoiceStreamFn }) {
   return (
     <div className="flex flex-col h-full overflow-hidden">
       <div className="flex-1 min-h-0 overflow-hidden">
         <ChatContainer />
       </div>
       <div className="flex-shrink-0">
-        <ChatInput onSend={onSend} />
+        <ChatInput onSend={onSend} onSendVoiceStream={onSendVoiceStream} />
       </div>
     </div>
   );