Add N8n integration with models, services, and routes

[gomessguii]

Add N8n integration with models, services, and routes

• Introduced N8n and N8nSetting models in both MySQL and PostgreSQL schemas.
• Implemented N8nController and N8nService for managing N8n bots.
• Created N8nRouter for handling API requests related to N8n.
• Added DTOs and validation schemas for N8n integration.
• Updated server module and chatbot controller to include N8n functionality.
• Configured environment settings for N8n integration.

Summary by Sourcery

Add a full N8n integration by defining database models, controllers, services, routes, DTOs, and validation schemas, wire them into the chatbot framework, and expose configuration to toggle the feature.

New Features:

• Introduce N8nController, N8nService, and N8nRouter to manage N8n bots, settings, and sessions via REST endpoints
• Add N8n and N8nSetting models with corresponding Prisma schema and migrations for MySQL and PostgreSQL
• Create DTOs and JSON validation schemas for N8n integration payloads and settings
• Extend ChatbotController, server module, and routers to emit and handle N8n workflow events
• Add environment variable support to enable or disable N8n integration

Enhancements:

• Reformat NodeCache initialization in the WhatsApp Baileys service

[sourcery-ai]

Reviewer's Guide

This PR adds full N8n integration by introducing database models and migrations, extending configuration, wiring new controllers and services into the chatbot flow, and providing routes along with DTOs and validation schemas.

File-Level Changes

Change	Details	Files
Introduce N8n integration configuration	Define N8n type in Env interface Load N8N_ENABLED flag in ConfigService defaults	src/config/env.config.ts
Register N8n service and controller in server module	Instantiate N8nService and expose N8nController Invoke n8nController.emit in ChatbotController workflow	src/api/server.module.ts src/api/integrations/chatbot/chatbot.controller.ts
Extend Chatbot routing to include N8n endpoints	Import N8nRouter and mount '/n8n' path Export N8n validation schema in chatbot.Schema	src/api/integrations/chatbot/chatbot.router.ts src/api/integrations/chatbot/chatbot.schema.ts
Add Prisma schemas and migration for N8n entities	Define N8n and N8nSetting models in MySQL and PostgreSQL schemas Add SQL migration with tables, indices and foreign keys	prisma/mysql-schema.prisma prisma/postgresql-schema.prisma prisma/postgresql-migrations/20250514232744_add_n8n_table/migration.sql
Implement N8nController handling CRUD and sessions	Extend ChatbotController to manage bots, settings and sessions Enforce integration flag and repository validations	src/api/integrations/chatbot/n8n/controllers/n8n.controller.ts
Develop N8nService for business logic and webhook communication	Implement CRUD operations for N8n bots Handle webhook calls, message parsing and session lifecycle	src/api/integrations/chatbot/n8n/services/n8n.service.ts
Define DTOs and validation schemas for N8n routes	Add N8nDto, N8nSettingDto and related classes Create JSON schemas for bot, settings, status and ignoreJid	src/api/integrations/chatbot/n8n/dto/n8n.dto.ts src/api/integrations/chatbot/n8n/validate/n8n.schema.ts
Minor code formatting adjustments in existing service	Fix indentation in userDevicesCache instantiation	src/api/integrations/channel/whatsapp/whatsapp.baileys.service.ts

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[muava12]

need more detail documentation for this update