feat(blog): add file-based blog with dynamic slugs, MDX content and layout shell

- Introduced blog routing using Next.js App Router
- Implemented dynamic [slug] pages for blog posts
- Added MDX-based content loading via lib/posts
- Integrated shared TopBar layout with navigation
- Established clear content, lib and component separation

apps/public-web/node_modules/next/dist/esm/lib/file-exists.js

@@ -0,0 +1,26 @@
+import { existsSync, promises } from 'fs';
+import isError from './is-error';
+export var FileType = /*#__PURE__*/ function(FileType) {
+    FileType["File"] = "file";
+    FileType["Directory"] = "directory";
+    return FileType;
+}({});
+export async function fileExists(fileName, type) {
+    try {
+        if (type === "file") {
+            const stats = await promises.stat(fileName);
+            return stats.isFile();
+        } else if (type === "directory") {
+            const stats = await promises.stat(fileName);
+            return stats.isDirectory();
+        }
+        return existsSync(fileName);
+    } catch (err) {
+        if (isError(err) && (err.code === 'ENOENT' || err.code === 'ENAMETOOLONG')) {
+            return false;
+        }
+        throw err;
+    }
+}
+
+//# sourceMappingURL=file-exists.js.map