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/lib/detached-promise.d.ts

@@ -0,0 +1,12 @@
+/**
+ * A `Promise.withResolvers` implementation that exposes the `resolve` and
+ * `reject` functions on a `Promise`.
+ *
+ * @see https://tc39.es/proposal-promise-with-resolvers/
+ */
+export declare class DetachedPromise<T = any> {
+    readonly resolve: (value: T | PromiseLike<T>) => void;
+    readonly reject: (reason: any) => void;
+    readonly promise: Promise<T>;
+    constructor();
+}