fix: resolve circular dependency UsersModule→AiModule→AuthModule→UsersModule

Wrap AiModule and AuthModule with forwardRef() in both UsersModule and
AiModule to let NestJS resolve the circular injection at runtime.

The cycle: UsersModule imports AiModule, AiModule imports AuthModule,
AuthModule imports UsersModule — all three legs now use forwardRef.

Author: zavxai

apps/api/src/ai/ai.module.ts

@@ -1,10 +1,10 @@
-import { Module } from '@nestjs/common';
+import { Module, forwardRef } from '@nestjs/common';
 import { AiService } from './ai.service';
 import { AiController } from './ai.controller';
 import { AuthModule } from '../auth/auth.module';
 
 @Module({
-  imports: [AuthModule],
+  imports: [forwardRef(() => AuthModule)],
   providers: [AiService],
   controllers: [AiController],
   exports: [AiService],

apps/api/src/users/users.module.ts

@@ -5,7 +5,7 @@ import { AuthModule } from '../auth/auth.module';
 import { AiModule } from '../ai/ai.module';
 
 @Module({
-  imports: [forwardRef(() => AuthModule), AiModule],
+  imports: [forwardRef(() => AuthModule), forwardRef(() => AiModule)],
   providers: [UsersService],
   controllers: [UsersController],
   exports: [UsersService],