feat(api): add inquiries, leads, and agents modules for Agent Portal

Build three new DDD modules following existing CQRS patterns:
- Inquiries: CRUD endpoints for buyer consultation requests with agent notification support
- Leads: Full lead lifecycle management with status state machine and conversion tracking
- Agents: Quality score calculation (event-driven on review changes) and dashboard stats API

All modules include unit tests (14 test files, all 797 tests pass).

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

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

@@ -0,0 +1,28 @@
+import { Module } from '@nestjs/common';
+import { CqrsModule } from '@nestjs/cqrs';
+import { CreateInquiryHandler } from './application/commands/create-inquiry/create-inquiry.handler';
+import { MarkInquiryReadHandler } from './application/commands/mark-inquiry-read/mark-inquiry-read.handler';
+import { GetInquiriesByAgentHandler } from './application/queries/get-inquiries-by-agent/get-inquiries-by-agent.handler';
+import { GetInquiriesByListingHandler } from './application/queries/get-inquiries-by-listing/get-inquiries-by-listing.handler';
+import { INQUIRY_REPOSITORY } from './domain/repositories/inquiry.repository';
+import { PrismaInquiryRepository } from './infrastructure/repositories/prisma-inquiry.repository';
+import { InquiriesController } from './presentation/controllers/inquiries.controller';
+
+const CommandHandlers = [CreateInquiryHandler, MarkInquiryReadHandler];
+
+const QueryHandlers = [
+  GetInquiriesByListingHandler,
+  GetInquiriesByAgentHandler,
+];
+
+@Module({
+  imports: [CqrsModule],
+  controllers: [InquiriesController],
+  providers: [
+    { provide: INQUIRY_REPOSITORY, useClass: PrismaInquiryRepository },
+    ...CommandHandlers,
+    ...QueryHandlers,
+  ],
+  exports: [INQUIRY_REPOSITORY],
+})
+export class InquiriesModule {}