feat: mobil uyumlu PWA — manifest, service worker, gercek kurulum, filtre cekmecesi

- public/manifest.webmanifest (standalone, tr, kisayollar) + 192/512 ve
  maskable ikonlar + apple-touch-icon; index.html PWA meta etiketleri
- public/sw.js: /assets cache-first (hash'li adlar), kabuk network-first,
  /api ASLA onbellekten (eski ihale gosterilmesin); surum degisince temizlik
- main.jsx: SW yalniz uretimde kaydedilir (dev'de HMR ile cakismasin)
- Mobil PWA sayfasindaki "Cihaza Yukle" dugmesi sahteydi (setInstalled(true));
  artik beforeinstallprompt ile gercek kurulum, standalone algilama, iOS/
  Android/masaustu yol tarifi
- Kucuk ekranda sol filtre paneli listeyi 72 satir asagi itiyordu: lg altinda
  "Filtreler" dugmesiyle acilan cekmece; sag panel xl altinda gizli

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

index.html

@@ -3,7 +3,14 @@
   <head>
     <meta charset="UTF-8" />
     <link rel="icon" type="image/svg+xml" href="data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 100 100%22><text y=%22.9em%22 font-size=%2290%22>🤖</text></svg>" />
-    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0, viewport-fit=cover" />
+    <link rel="manifest" href="/manifest.webmanifest" />
+    <meta name="theme-color" content="#1f2937" />
+    <meta name="mobile-web-app-capable" content="yes" />
+    <meta name="apple-mobile-web-app-capable" content="yes" />
+    <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
+    <meta name="apple-mobile-web-app-title" content="İhaleist" />
+    <link rel="apple-touch-icon" href="/icons/apple-touch-icon.png" />
     <title>İhaleist — Akıllı İhale Takip ve Analiz Platformu</title>
     <meta name="description" content="Kamu ve özel sektör ihalelerini tek yerde takip edin; yapay zeka ile uygunluk, risk ve fırsat analizi yapın." />
     <meta name="robots" content="index, follow" />