Enable KeyStatic CMS for production

Changes:
- Added Netlify adapter for server-side rendering
- Changed output mode from static to server
- Updated KeyStatic storage from local to GitHub
- Removed SKIP_KEYSTATIC from Netlify build
- KeyStatic Admin UI will be available at /keystatic

Features:
- Server-side rendering with Netlify Functions
- GitHub integration for content management
- Production-ready KeyStatic Admin UI

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

.netlify/build/chunks/Cevrim2-669x272_D1IahUqi.mjs

@@ -0,0 +1,14 @@
+const Cevrim2669x272 = new Proxy({"src":"/_astro/Cevrim2-669x272.TNbasIn9.png","width":669,"height":272,"format":"png"}, {
+						get(target, name, receiver) {
+							if (name === 'clone') {
+								return structuredClone(target);
+							}
+							if (name === 'fsPath') {
+								return "/Users/bugracanata/Developer/[Telsiz]/ARC-Web-Sitesi/src/assets/images/2025/03/Cevrim2-669x272.png";
+							}
+							
+							return target[name];
+						}
+					});
+
+export { Cevrim2669x272 as default };