feat(chatbot): implement base chatbot structure and enhance integration capabilities

- Introduced a base structure for chatbot integrations, including BaseChatbotController and BaseChatbotService.
- Added common DTOs for chatbot settings and data to streamline integration processes.
- Updated existing chatbot controllers (Dify, Evoai, N8n) to extend from the new base classes, improving code reusability and maintainability.
- Enhanced media message handling across integrations, including audio transcription capabilities using OpenAI's Whisper API.
- Refactored service methods to accommodate new message structures and improve error handling.

src/api/integrations/chatbot/dify/dto/dify.dto.ts

@@ -1,38 +1,13 @@
 import { $Enums, TriggerOperator, TriggerType } from '@prisma/client';
+import { BaseChatbotDto, BaseChatbotSettingDto } from '../../base-chatbot.dto';
 
-export class DifyDto {
-  enabled?: boolean;
-  description?: string;
+export class DifyDto extends BaseChatbotDto {
+  // Dify specific fields
   botType?: $Enums.DifyBotType;
   apiUrl?: string;
   apiKey?: string;
-  expire?: number;
-  keywordFinish?: string;
-  delayMessage?: number;
-  unknownMessage?: string;
-  listeningFromMe?: boolean;
-  stopBotFromMe?: boolean;
-  keepOpen?: boolean;
-  debounceTime?: number;
-  triggerType?: TriggerType;
-  triggerOperator?: TriggerOperator;
-  triggerValue?: string;
-  ignoreJids?: any;
-  splitMessages?: boolean;
-  timePerChar?: number;
 }
 
-export class DifySettingDto {
-  expire?: number;
-  keywordFinish?: string;
-  delayMessage?: number;
-  unknownMessage?: string;
-  listeningFromMe?: boolean;
-  stopBotFromMe?: boolean;
-  keepOpen?: boolean;
-  debounceTime?: number;
-  difyIdFallback?: string;
-  ignoreJids?: any;
-  splitMessages?: boolean;
-  timePerChar?: number;
+export class DifySettingDto extends BaseChatbotSettingDto {
+  // Dify specific fields
 }