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/pages/api/feed/_category_.xml.astro.mjs

@@ -0,0 +1,61 @@
+import rss from '@astrojs/rss';
+import { g as getCollection } from '../../../chunks/_astro_content_BsTdlqxn.mjs';
+export { renderers } from '../../../renderers.mjs';
+
+function slugify(str) {
+  return str.toLowerCase().replace(/ş/g, "s").replace(/ı/g, "i").replace(/ğ/g, "g").replace(/ü/g, "u").replace(/ö/g, "o").replace(/ç/g, "c").replace(/[^a-z0-9]+/g, "-");
+}
+async function getStaticPaths() {
+  const posts = await getCollection("post");
+  const categoryMap = /* @__PURE__ */ new Map();
+  posts.forEach((post) => {
+    if (post.data.categories) {
+      post.data.categories.forEach((cat) => {
+        if (!categoryMap.has(cat)) {
+          categoryMap.set(cat, slugify(cat));
+        }
+      });
+    }
+    if (post.data.category) {
+      if (!categoryMap.has(post.data.category)) {
+        categoryMap.set(post.data.category, slugify(post.data.category));
+      }
+    }
+  });
+  return Array.from(categoryMap.entries()).map(([category, slug]) => ({
+    params: { category: slug },
+    props: { originalCategory: category }
+  }));
+}
+async function GET(context) {
+  const posts = await getCollection("post");
+  const originalCategory = context.props.originalCategory;
+  const filteredPosts = posts.filter(
+    (post) => post.data.categories?.includes(originalCategory) || post.data.category === originalCategory
+  ).filter((post) => post.data.publishDate).sort((a, b) => {
+    const aDate = a.data.publishDate || /* @__PURE__ */ new Date(0);
+    const bDate = b.data.publishDate || /* @__PURE__ */ new Date(0);
+    return bDate.valueOf() - aDate.valueOf();
+  }).slice(0, 20);
+  return rss({
+    title: `ARC - ${originalCategory} Blog Yazıları`,
+    description: `Amatör Radyocular Derneği - ${originalCategory} kategorisindeki blog yazıları`,
+    site: context.site?.toString() || "https://radio.org.tr",
+    items: filteredPosts.map((post) => ({
+      title: post.data.title,
+      pubDate: post.data.publishDate,
+      description: post.data.excerpt || "",
+      link: `/blog/${post.slug}/`
+    }))
+  });
+}
+
+const _page = /*#__PURE__*/Object.freeze(/*#__PURE__*/Object.defineProperty({
+  __proto__: null,
+  GET,
+  getStaticPaths
+}, Symbol.toStringTag, { value: 'Module' }));
+
+const page = () => _page;
+
+export { page };