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/cli/next-dev.d.ts

@@ -0,0 +1,21 @@
+#!/usr/bin/env node
+import '../server/lib/cpu-profile';
+import { type DebugAddress } from '../server/lib/utils';
+export type NextDevOptions = {
+    disableSourceMaps: boolean;
+    inspect?: DebugAddress | true;
+    turbo?: boolean;
+    turbopack?: boolean;
+    webpack?: boolean;
+    port: number;
+    hostname?: string;
+    experimentalHttps?: boolean;
+    experimentalHttpsKey?: string;
+    experimentalHttpsCert?: string;
+    experimentalHttpsCa?: string;
+    experimentalUploadTrace?: string;
+    experimentalNextConfigStripTypes?: boolean;
+};
+type PortSource = 'cli' | 'default' | 'env';
+declare const nextDev: (options: NextDevOptions, portSource: PortSource, directory?: string) => Promise<void>;
+export { nextDev };