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/_@astrojs-ssr-adapter_CvSoi7hX.mjs

@@ -0,0 +1,25 @@
+import * as ssrFunction_js from '@astrojs/netlify/ssr-function.js';
+
+function _mergeNamespaces(n, m) {
+	for (var i = 0; i < m.length; i++) {
+		const e = m[i];
+		if (typeof e !== 'string' && !Array.isArray(e)) { for (const k in e) {
+			if (k !== 'default' && !(k in n)) {
+				const d = Object.getOwnPropertyDescriptor(e, k);
+				if (d) {
+					Object.defineProperty(n, k, d.get ? d : {
+						enumerable: true,
+						get: () => e[k]
+					});
+				}
+			}
+		} }
+	}
+	return Object.freeze(Object.defineProperty(n, Symbol.toStringTag, { value: 'Module' }));
+}
+
+const serverEntrypointModule = /*#__PURE__*/_mergeNamespaces({
+	__proto__: null
+}, [ssrFunction_js]);
+
+export { serverEntrypointModule as s };