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>
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