feat: Add NATS integration support to the event system

- Added NATS package to dependencies
- Created Prisma schema models for NATS configuration
- Implemented NATS controller, router, and event management
- Updated instance controller and event manager to support NATS
- Added NATS configuration options in environment configuration
- Included NATS events in instance validation schema

src/api/integrations/event/event.dto.ts

@@ -26,6 +26,11 @@ export class EventDto {
     events?: string[];
   };
 
+  nats?: {
+    enabled?: boolean;
+    events?: string[];
+  };
+
   pusher?: {
     enabled?: boolean;
     appId?: string;
@@ -63,6 +68,11 @@ export function EventInstanceMixin<TBase extends Constructor>(Base: TBase) {
       events?: string[];
     };
 
+    nats?: {
+      enabled?: boolean;
+      events?: string[];
+    };
+
     pusher?: {
       enabled?: boolean;
       appId?: string;