fix(du-an): stop detail page crash from thin backend payload + client/server flag boundary

- Split `isResidentialProjectsEnabledServer` out of the `'use client'`
  hook file into `lib/feature-flags/residential-projects.ts` so Server
  Components can import it without Next.js treating it as a client ref.
- Detail endpoint preserves `media` via new `shapeProjectDetail`
  instead of stripping it in `shapeProject`.
- `fetchProjectBySlug` now normalizes the response: fills missing
  arrays (media, blocks, amenities, priceRanges, priceHistory,
  neighborhoodScores, pois, documents) with `[]`, remaps
  `developer.logo` → `logoUrl`, defaults `totalProjects` to 0.

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

apps/api/src/modules/projects/presentation/controllers/projects.controller.ts

@@ -35,6 +35,16 @@ function shapeProject<T extends RawProjectListItem>(row: T) {
   };
 }
 
+function shapeProjectDetail<T extends RawProjectListItem>(row: T) {
+  // Detail endpoint: preserve `media` so the gallery on the frontend can
+  // render, and keep the same shape as the list response for everything else.
+  const shaped = shapeProject(row);
+  return {
+    ...shaped,
+    media: Array.isArray(row.media) ? row.media : [],
+  };
+}
+
 @ApiTags('projects')
 @Controller('projects')
 export class ProjectsController {
@@ -78,7 +88,7 @@ export class ProjectsController {
     if (!result) {
       throw new NotFoundException('Dự án', slugOrId);
     }
-    return shapeProject(result);
+    return shapeProjectDetail(result);
   }
 
   // ── Admin endpoints ───────────────────────────────────────────────