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]/admin/layout.tsx

@@ -73,13 +73,13 @@ export default function AdminLayout({ children }: { children: React.ReactNode })
                     href={item.href}
                     onClick={() => setSidebarOpen(false)}
                     className={`
-                      flex items-center px-4 py-3 text-xs font-semibold rounded-xl transition-all duration-150
+                      flex items-center px-4 py-3 text-xs font-semibold rounded-xl transition-all duration-150 min-h-[44px]
                       ${isActive 
-                        ? 'bg-white/5 border-l-4 border-turquoise text-stone pl-3' 
-                        : 'text-stone/75 hover:bg-white/5 hover:text-stone'}
+                        ? 'bg-turquoise/15 text-turquoise font-bold' 
+                        : 'text-stone/80 hover:bg-white/10 hover:text-stone'}
                     `}
                   >
-                    <item.icon className={`mr-3 flex-shrink-0 h-4.5 w-4.5 ${isActive ? 'text-turquoise' : 'text-stone/50'}`} />
+                    <item.icon className={`mr-3 flex-shrink-0 h-4.5 w-4.5 ${isActive ? 'text-turquoise' : 'text-stone/60'}`} />
                     {item.name}
                   </Link>
                 )
@@ -90,10 +90,11 @@ export default function AdminLayout({ children }: { children: React.ReactNode })
           {/* Logout Action */}
           <div className="p-4 border-t border-white/10">
             <button
+              type="button"
               onClick={() => signOut({ callbackUrl: '/' })}
-              className="flex w-full items-center px-4 py-3 text-xs font-semibold text-red-400 hover:text-red-300 rounded-xl hover:bg-red-950/20 transition-colors"
+              className="flex w-full items-center px-4 py-3 text-xs font-semibold text-bougainvillea hover:bg-bougainvillea/10 rounded-xl transition-colors min-h-[44px] cursor-pointer"
             >
-              <LogOut className="mr-3 h-4.5 w-4.5 text-red-400/70" />
+              <LogOut className="mr-3 h-4.5 w-4.5 text-bougainvillea" />
               Çıkış Yap
             </button>
           </div>

app/[locale]/admin/listings/[id]/page.tsx

@@ -23,12 +23,14 @@ export default async function AdminListingEditPage({ params }: Props) {
 
   const categoryOptions = categories.map(c => ({
     value: c.id,
-    label: c.nameTr
+    label: c.nameTr,
+    slug: c.slug
   }))
 
   const neighborhoodOptions = neighborhoods.map(n => ({
     value: n.id,
-    label: n.nameTr
+    label: n.nameTr,
+    slug: n.slug
   }))
 
   return (