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/ui/language-switcher.tsx

@@ -1,12 +1,13 @@
 'use client';
 
+import { Globe } from 'lucide-react';
 import { useLocale, useTranslations } from 'next-intl';
 import type { Locale } from '@/i18n/config';
 import { usePathname, useRouter } from '@/i18n/navigation';
 
 const localeLabels: Record<Locale, string> = {
-  vi: '🇻🇳 VI',
-  en: '🇬🇧 EN',
+  vi: 'VI',
+  en: 'EN',
 };
 
 export function LanguageSwitcher() {
@@ -28,6 +29,7 @@ export function LanguageSwitcher() {
       className="inline-flex h-9 items-center gap-1.5 rounded-md px-2.5 text-sm font-medium text-muted-foreground transition-colors hover:bg-accent hover:text-accent-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2"
       aria-label={`${t('label')}: ${t(locale)} → ${t(nextLocale)}`}
     >
+      <Globe className="h-4 w-4" aria-hidden="true" />
       <span aria-hidden="true">{localeLabels[nextLocale]}</span>
       <span className="sr-only">{t(nextLocale)}</span>
     </button>