feat: add auth proxy controller for login and token exchange

Adds POST /auth/login and POST /auth/tokens endpoints that proxy
GraphQL mutations to the fortytwo-eap-core platform, letting the
frontend use only the sidecar URL for authentication.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app.module.ts

@@ -2,8 +2,10 @@ import { Module } from '@nestjs/common';
 import { ConfigModule } from '@nestjs/config';
 import configuration from './config/configuration';
 import { AiModule } from './ai/ai.module';
+import { AuthModule } from './auth/auth.module';
 import { PlatformModule } from './platform/platform.module';
 import { ExotelModule } from './exotel/exotel.module';
+import { CallEventsModule } from './call-events/call-events.module';
 
 @Module({
     imports: [
@@ -12,8 +14,10 @@ import { ExotelModule } from './exotel/exotel.module';
             isGlobal: true,
         }),
         AiModule,
+        AuthModule,
         PlatformModule,
         ExotelModule,
+        CallEventsModule,
     ],
 })
 export class AppModule {}