Merge remote-tracking branch 'origin/develop' into feat/optimize

# Conflicts:
#	frontend/src/lib/errors.ts

frontend/src/components/ChatPanel/index.tsx

@@ -17,7 +17,7 @@ interface ChatPanelProps {
   currentScenario?: string;
   isProcessing?: boolean;
   isVADReady?: boolean;
-  vadError?: string;
+  vadError?: string | null;
   isMicOn?: boolean;
   isSpeaking?: boolean;
   onSendText?: (text: string) => void;

frontend/src/lib/errors.ts

@@ -3,8 +3,6 @@
 // 来源：docs/03-接口文档.md §五 错误码
 // ============================================================
 
-// ErrorCode type reserved for future use
-
 /** 将错误码转为用户友好文案（需要传入翻译函数） */
 export function getErrorMessage(code: string, translate: (key: string) => string): string {
   const key = `error.${code}`;