feat: Add agent type ID field to registration DTO and implement validation for agent role registration.

src/auth/auth.service.ts

@@ -36,6 +36,22 @@ export class AuthService {
   // REGISTER
   // ==========================================
   async register(dto: RegisterDto) {
+    // Validate agentTypeId is required for AGENT role
+    if (dto.role === 'AGENT') {
+      if (!dto.agentTypeId) {
+        throw new BadRequestException('Agent type is required for agent registration');
+      }
+
+      // Verify agent type exists
+      const agentType = await this.prisma.agentType.findUnique({
+        where: { id: dto.agentTypeId },
+      });
+
+      if (!agentType) {
+        throw new BadRequestException('Invalid agent type selected');
+      }
+    }
+
     // Check if user exists
     const existingUser = await this.prisma.user.findUnique({
       where: { email: dto.email.toLowerCase() },
@@ -79,6 +95,7 @@ export class AuthService {
           slug,
           firstName: dto.firstName,
           lastName: dto.lastName,
+          ...(dto.agentTypeId && { agentTypeId: dto.agentTypeId }),
         },
       });
     }