test(e2e): update all E2E specs for latest API and fixtures

Update 17 E2E test files including admin, auth, inquiries, listings,
payments, search, subscriptions, and MCP specs. Update listings fixture
and global setup to align with latest schema changes.

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

e2e/fixtures/listings.fixture.ts

@@ -31,7 +31,7 @@ export async function createListing(
   overrides: Record<string, unknown> = {},
 ) {
   const data = createTestListing(overrides);
-  const res = await request.post('/listings', {
+  const res = await request.post('listings', {
     data,
     headers: { Authorization: `Bearer ${accessToken}` },
   });