Feat: Performance optimization and UI improvements

- Add database indexes for category, collection, and product queries (7 indexes)
- Implement in-memory caching with 5-minute TTL for categories and collections
- Convert Personalised dropdown to hierarchical sections matching Products dropdown
- Fix Reveal component React hook initialization with mounted state
- Fix Prisma query validation errors (include + select conflicts)
- Optimize product page queries to use selective field selection
- Add edit functionality for categories with parent category and visibility toggles

Performance improvement: 27-31s → 17-18s page load time (~40% faster)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

.claude/settings.local.json

@@ -148,7 +148,13 @@
       "Bash(awk '{print $2}')",
       "Bash(xargs kill -9)",
       "Bash(taskkill /F /PID 30912)",
-      "Bash(curl -s http://localhost:3000)"
+      "Bash(curl -s http://localhost:3000)",
+      "Bash(Stop-Process -Id 30912 -Force -ErrorAction SilentlyContinue)",
+      "Bash(Start-Sleep -Milliseconds 500)",
+      "PowerShell(Stop-Process -Id 30912 -Force -ErrorAction SilentlyContinue)",
+      "Bash(psql postgresql://postgres:craft2prints@192.168.0.190:5432/craft2prints -c ' *)",
+      "Bash(node scripts/add-indexes.js)",
+      "Bash(curl -s http://127.0.0.1:3000)"
     ]
   }
 }