feat(auth): add handler specs and improve auth infrastructure

Add unit tests for get-profile, get-agent-by-user-id, and verify-kyc handlers.
Improve OAuth service, local strategy, and repository implementations with
proper ConfigService injection and error handling.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/api/src/modules/auth/auth.module.ts

@@ -34,15 +34,17 @@ const QueryHandlers = [GetProfileHandler, GetAgentByUserIdHandler];
   imports: [
     CqrsModule,
     PassportModule,
-    JwtModule.register({
-      secret: (() => {
+    JwtModule.registerAsync({
+      useFactory: () => {
         const secret = process.env['JWT_SECRET'];
         if (!secret) {
           throw new Error('JWT_SECRET environment variable is required');
         }
-        return secret;
-      })(),
-      signOptions: { expiresIn: '15m', audience: 'goodgo-api', issuer: 'goodgo-platform' },
+        return {
+          secret,
+          signOptions: { expiresIn: '15m', audience: 'goodgo-api', issuer: 'goodgo-platform' },
+        };
+      },
     }),
   ],
   controllers: [AuthController, OAuthController],