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/base-chatbot.dto.ts

@@ -0,0 +1,42 @@
+import { TriggerOperator, TriggerType } from '@prisma/client';
+
+/**
+ * Base DTO for all chatbot integrations
+ * Contains common properties shared by all chatbot types
+ */
+export class BaseChatbotDto {
+  enabled?: boolean;
+  description: string;
+  expire?: number;
+  keywordFinish?: string[];
+  delayMessage?: number;
+  unknownMessage?: string;
+  listeningFromMe?: boolean;
+  stopBotFromMe?: boolean;
+  keepOpen?: boolean;
+  debounceTime?: number;
+  triggerType: TriggerType;
+  triggerOperator?: TriggerOperator;
+  triggerValue?: string;
+  ignoreJids?: string[];
+  splitMessages?: boolean;
+  timePerChar?: number;
+}
+
+/**
+ * Base settings DTO for all chatbot integrations
+ */
+export class BaseChatbotSettingDto {
+  expire?: number;
+  keywordFinish?: string[];
+  delayMessage?: number;
+  unknownMessage?: string;
+  listeningFromMe?: boolean;
+  stopBotFromMe?: boolean;
+  keepOpen?: boolean;
+  debounceTime?: number;
+  ignoreJids?: any;
+  splitMessages?: boolean;
+  timePerChar?: number;
+  fallbackId?: string; // Unified fallback ID field for all integrations
+}