Add opener audio functionality to Assistant model and related schemas, enabling audio generation and playback features. Update API routes and frontend components to support opener audio management, including status retrieval and generation controls.

web/types.ts

@@ -6,6 +6,10 @@ export interface Assistant {
   firstTurnMode?: 'bot_first' | 'user_first';
   opener: string;
   generatedOpenerEnabled?: boolean;
+  openerAudioEnabled?: boolean;
+  openerAudioReady?: boolean;
+  openerAudioDurationMs?: number;
+  openerAudioUpdatedAt?: string;
   prompt: string;
   knowledgeBaseId: string;
   language: 'zh' | 'en';