feat: harden admin security, add AI trip planner, map view, and SEO/notification improvements

Security:
- requireAdmin() session check added to every admin-only server action
  (previously relied only on middleware path matching, which Next.js
  Server Actions don't reliably respect)
- Real Prisma + bcrypt admin auth, replacing hardcoded credentials; split
  into an Edge-safe auth.config.ts (used by proxy.ts) and the full
  Prisma-backed auth.ts (route handler, server actions, server components)
- Removed hardcoded fallback secret on the Instagram sync cron endpoint
- Honeypot field + per-IP rate limiting on contact/business-submission
  forms and the analytics events endpoint

Features:
- AI trip planner (/plan-olustur, /plan/[id]) backed by DeepSeek, grounded
  to only recommend isLocalApproved listings, with a deterministic
  link-injection fallback for anything the model doesn't format as markdown
- Interactive Leaflet/OpenStreetMap view on category listing pages
- Telegram notifications for new contact messages and business submissions

SEO:
- Brand-consistent favicon/apple-icon/PWA icons and default Open Graph/
  Twitter share images, generated via next/og (replacing default Next.js
  placeholders)
- BreadcrumbList structured data on category and listing detail pages
- Fixed two remaining raw <img> tags to use next/image

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/[locale]/add-business/page.tsx

@@ -1,3 +1,5 @@
+import type { Metadata } from 'next'
+import { basicMetadata } from '@/lib/seo'
 import { getTranslations, setRequestLocale } from 'next-intl/server'
 import { mockDb } from '@/lib/mockDb'
 import BusinessForm from './BusinessForm'
@@ -6,6 +8,13 @@ interface AddBusinessPageProps {
   params: Promise<{ locale: string }>
 }
 
+export async function generateMetadata({ params }: AddBusinessPageProps): Promise<Metadata> {
+  const { locale } = await params
+  const title = locale === 'en' ? 'Add Your Business — Marmaris Local' : locale === 'ru' ? 'Добавить заведение — Marmaris Local' : 'İşletme Ekle — Marmaris Local'
+  const description = locale === 'en' ? 'Apply to get your Marmaris business curated and featured with the Yerel Onaylı seal.' : locale === 'ru' ? 'Подайте заявку на включение вашего заведения в гид Marmaris Local.' : 'İşletmenizi Marmaris Local rehberine ekleyin ve Yerel Onaylı mührünü alın.'
+  return basicMetadata(title, description, locale, '/add-business')
+}
+
 export default async function AddBusinessPage({ params }: AddBusinessPageProps) {
   const { locale } = await params
   setRequestLocale(locale)