feat(analytics): integrate AI/ML services — AVM endpoint, moderation pipeline, market index cron

- Add AiServiceClient HTTP client for Python FastAPI AI service with timeout and fallback
- Add HttpAVMService that calls Python AVM endpoint, falls back to PrismaAVMService on failure
- Add ListingCreatedModerationHandler: auto-flags suspicious listings via AI moderation on create
- Add MarketIndexCronService: daily cron job aggregating market stats per district/city/type
- Wire ScheduleModule and new providers into AnalyticsModule and AppModule
- Add unit tests for AiServiceClient, HttpAVMService, and moderation handler (all passing)

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

e2e/api/inquiries.spec.ts

@@ -0,0 +1,106 @@
+import { test, expect, createListing, registerUser } from '../fixtures';
+
+test.describe('Inquiries API', () => {
+  test('POST /inquiries — creates inquiry for a listing', async ({
+    request,
+    authedRequest,
+    testTokens,
+  }) => {
+    const { listing } = await createListing(request, testTokens.accessToken);
+
+    const res = await authedRequest.post('/inquiries', {
+      data: {
+        listingId: listing.listingId,
+        message: 'Tôi muốn xem căn hộ này',
+        phone: '0901234567',
+      },
+    });
+
+    expect(res.status()).toBe(201);
+    const body = await res.json();
+    expect(body).toHaveProperty('inquiryId');
+    expect(body.listingId).toBe(listing.listingId);
+  });
+
+  test('POST /inquiries — rejects without auth', async ({ request }) => {
+    const res = await request.post('/inquiries', {
+      data: {
+        listingId: 'nonexistent',
+        message: 'Test inquiry',
+      },
+    });
+
+    expect(res.status()).toBe(401);
+  });
+
+  test('GET /inquiries/listing/:id — returns inquiries for a listing', async ({
+    request,
+    authedRequest,
+    testTokens,
+  }) => {
+    const { listing } = await createListing(request, testTokens.accessToken);
+
+    // Create an inquiry first
+    await authedRequest.post('/inquiries', {
+      data: {
+        listingId: listing.listingId,
+        message: 'Inquiry E2E test',
+      },
+    });
+
+    const res = await authedRequest.get(`/inquiries/listing/${listing.listingId}`);
+
+    expect(res.status()).toBe(200);
+    const body = await res.json();
+    expect(body).toHaveProperty('data');
+    expect(body).toHaveProperty('total');
+    expect(body.data.length).toBeGreaterThanOrEqual(1);
+  });
+});
+
+test.describe('Leads API', () => {
+  test('POST /leads — creates a lead (agent only)', async ({
+    request,
+    authedRequest,
+    testTokens,
+  }) => {
+    const { listing } = await createListing(request, testTokens.accessToken);
+
+    const res = await authedRequest.post('/leads', {
+      data: {
+        listingId: listing.listingId,
+        buyerName: 'Nguyễn Văn A',
+        buyerPhone: '0912345678',
+        source: 'WEBSITE',
+        notes: 'Khách quan tâm căn hộ Q1',
+      },
+    });
+
+    // May fail if user is not AGENT role — that's expected behavior
+    if (res.status() === 201) {
+      const body = await res.json();
+      expect(body).toHaveProperty('leadId');
+    } else {
+      // Non-agent users get 403
+      expect(res.status()).toBe(403);
+    }
+  });
+});
+
+test.describe('Agent Dashboard API', () => {
+  test('GET /agents/dashboard — returns stats for agent', async ({
+    authedRequest,
+  }) => {
+    const res = await authedRequest.get('/agents/dashboard');
+
+    // May return 403 if test user is not an agent
+    if (res.status() === 200) {
+      const body = await res.json();
+      expect(body).toHaveProperty('qualityScore');
+      expect(body).toHaveProperty('totalLeads');
+      expect(body).toHaveProperty('totalInquiries');
+    } else {
+      expect(res.status()).toBe(403);
+    }
+  });
+});