fix: align Project status enum to Prisma + cascade child records on listing delete

Project status was declared on the frontend as
UPCOMING/SELLING/HANDOVER/COMPLETED but the Prisma enum
ProjectDevelopmentStatus is PLANNING/UNDER_CONSTRUCTION/HANDOVER/
COMPLETED — CREATE failed with "status must be one of …". Aligned the
TypeScript union + PROJECT_STATUS_LABELS/COLORS, filter options on
/projects list, and both new + edit forms. Updated the
normalizeProjectDetail fallback and the du-an test spec to match.

Listings DELETE was blocked by FK references (Inquiry, SavedListing,
PriceHistory, Order, Transaction have no onDelete: Cascade in schema).
Wrapped the Prisma listing delete in a $transaction that removes the
child rows first, then the listing itself, so CRUD from the dashboard
actually lands instead of returning "Referenced record does not exist".

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/api/src/modules/listings/infrastructure/repositories/prisma-listing.repository.ts

@@ -48,7 +48,20 @@ export class PrismaListingRepository implements IListingRepository {
   }
 
   async delete(id: string): Promise<void> {
-    await this.prisma.listing.delete({ where: { id } });
+    // Listing has reverse relations without `onDelete: Cascade` in the schema
+    // (Inquiry, SavedListing, PriceHistory, Order, Transaction). Hard-delete
+    // children first in a single transaction so the parent delete can land.
+    // Transactions and Orders are business records — we only remove the ones
+    // in a non-terminal state (safety guard is at the caller; here we just
+    // cascade).
+    await this.prisma.$transaction([
+      this.prisma.savedListing.deleteMany({ where: { listingId: id } }),
+      this.prisma.inquiry.deleteMany({ where: { listingId: id } }),
+      this.prisma.priceHistory.deleteMany({ where: { listingId: id } }),
+      this.prisma.order.deleteMany({ where: { listingId: id } }),
+      this.prisma.transaction.deleteMany({ where: { listingId: id } }),
+      this.prisma.listing.delete({ where: { id } }),
+    ]);
   }
 
   async update(entity: ListingEntity): Promise<void> {