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/App.jsx

@@ -25,6 +25,7 @@ import { DocumentVault } from './components/tools/DocumentVault';
 import { AnalyticsDashboard } from './components/tools/AnalyticsDashboard';
 import { ApiWebhooks } from './components/tools/ApiWebhooks';
 import { PwaSettings } from './components/tools/PwaSettings';
+import { AiModelSettings } from './components/tools/AiModelSettings';
 
 const MainContent = () => {
   const { activeTab } = useApp();
@@ -57,6 +58,7 @@ const MainContent = () => {
       {activeTab === 'analitik_dashboard' && <AnalyticsDashboard />}
       {activeTab === 'api_webhooks' && <ApiWebhooks />}
       {activeTab === 'pwa_settings' && <PwaSettings />}
+      {activeTab === 'ai_ayarlari' && <AiModelSettings />}
 
       {/* Global Modals */}
       <DetailedSearchModal />