feat: comprehensive seed, Lucide icons, grouped dashboard nav, API fixes

- Rewrite prisma/seed.ts to populate all 27 models with realistic
  Vietnamese real estate data (8 users with login, 10 properties,
  10 listings, orders, payments, reviews, notifications, etc.)
- Replace all emoji icons with Lucide React SVG icons across frontend
  for consistent rendering, sizing, and accessibility
- Redesign dashboard nav: grouped sidebar with section headers,
  primary/secondary split on desktop, icon-only secondary items
- Replace language switcher flag emoji with Globe icon
- Replace SVG theme toggle with Lucide Moon/Sun icons
- Fix API startup: graceful fallback for Sentry profiling, Google OAuth,
  and Zalo OAuth when credentials are not configured
- Relax rate limiting in development mode (10k req/min)
- Fix listings API to include media[] array in search response
- Add optional chaining for property.media across frontend components
- Update OAuth strategy tests to match graceful fallback behavior

Co-Authored-By: Claude Opus 4 (1M context) <noreply@anthropic.com>

apps/web/components/map/listing-map.tsx

@@ -140,9 +140,9 @@ export function ListingMap({ listings, onMarkerClick, selectedListingId, classNa
     const container = document.createElement('div');
     container.style.fontFamily = 'system-ui,sans-serif';
 
-    if (listing.property.media.length > 0) {
+    if ((listing.property.media?.length ?? 0) > 0) {
       const img = document.createElement('img');
-      img.src = listing.property.media[0]!.url;
+      img.src = listing.property.media![0]!.url;
       img.alt = listing.property.title;
       img.style.cssText = 'width:100%;height:96px;object-fit:cover;border-radius:6px;margin-bottom:8px;';
       container.appendChild(img);