feat(admin): AI model yönetimi paneli (fallback zinciri seçimi)

- 6 model kataloğu: GLM 5.3, DeepSeek V4 Flash, Gemini 3.7 Flash, Grok 4.6, GPT-5.6 Sol, Claude Opus 5
- Varsayılan fallback zinciri: GLM (birincil) → DeepSeek → Gemini
- Admin panelden sıralama, birincil seçme, ekleme/çıkarma; localStorage'da saklanır
- AI analizi aktif modeli kullanır

src/components/TopNavigation.jsx

@@ -1,6 +1,6 @@
 import React from 'react';
 import { useApp } from '../context/AppContext';
-import { Newspaper, Trophy, CalendarDays, FileCheck2, Calculator, TrendingUp, LayoutGrid, Kanban, Radar, FolderKanban, BarChart3, Webhook, Smartphone } from 'lucide-react';
+import { Newspaper, Trophy, CalendarDays, FileCheck2, Calculator, TrendingUp, LayoutGrid, Kanban, Radar, FolderKanban, BarChart3, Webhook, Smartphone, Cpu } from 'lucide-react';
 
 export const TopNavigation = () => {
   const { activeTab, setActiveTab } = useApp();
@@ -18,6 +18,7 @@ export const TopNavigation = () => {
     { id: 'dokuman_deposu', label: 'Doküman Deposu', icon: FolderKanban },
     { id: 'analitik_dashboard', label: 'Analitik Dashboard', icon: BarChart3 },
     { id: 'api_webhooks', label: 'API & Webhooks', icon: Webhook },
+    { id: 'ai_ayarlari', label: 'AI Model Ayarları', icon: Cpu, badge: 'Admin' },
     { id: 'pwa_settings', label: 'Mobil PWA', icon: Smartphone }
   ];