test(e2e): add comprehensive E2E tests for listings, search, payments, subscriptions, admin

Expand Playwright E2E test coverage from 17 to 86 tests covering:
- Listings CRUD (create, search, filter, detail, status update)
- Search (text search, geo search, validation, Typesense fallback)
- Payments (create, list transactions, auth guards)
- Subscriptions (plans, create, quota, billing, usage metering)
- Admin authorization guards (all endpoints reject non-admin users)

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

e2e/fixtures/index.ts

@@ -1,3 +1,4 @@
 export { test, expect } from './auth.fixture';
 export { createTestUser, registerUser, loginUser } from './auth.fixture';
 export type { TokenPair } from './auth.fixture';
+export { createTestListing, createListing } from './listings.fixture';

e2e/fixtures/listings.fixture.ts

@@ -0,0 +1,43 @@
+import { type APIRequestContext } from '@playwright/test';
+
+/** Creates a valid listing payload for E2E tests. */
+export function createTestListing(overrides: Record<string, unknown> = {}) {
+  const suffix = Date.now();
+  return {
+    transactionType: 'SALE',
+    propertyType: 'APARTMENT',
+    title: `Test Listing ${suffix}`,
+    description: `E2E test listing description for automated testing ${suffix}`,
+    address: '123 Nguyễn Huệ',
+    ward: 'Bến Nghé',
+    district: 'Quận 1',
+    city: 'Hồ Chí Minh',
+    latitude: 10.7769,
+    longitude: 106.7009,
+    areaM2: 75,
+    priceVND: 5000000000,
+    bedrooms: 2,
+    bathrooms: 2,
+    floors: 1,
+    direction: 'SOUTH',
+    ...overrides,
+  };
+}
+
+/** Creates a listing via the API and returns its id + full response. */
+export async function createListing(
+  request: APIRequestContext,
+  accessToken: string,
+  overrides: Record<string, unknown> = {},
+) {
+  const data = createTestListing(overrides);
+  const res = await request.post('/listings', {
+    data,
+    headers: { Authorization: `Bearer ${accessToken}` },
+  });
+  if (!res.ok()) {
+    const body = await res.text();
+    throw new Error(`Create listing failed (${res.status()}): ${body}`);
+  }
+  return { listing: await res.json(), data };
+}