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/server/lib/router-server.d.ts

@@ -0,0 +1,22 @@
+import '../node-environment';
+import '../require-hook';
+import { type Span } from '../../trace';
+import type { ServerInitResult } from './render-server';
+export type RenderServer = Pick<typeof import('./render-server'), 'initialize' | 'clearModuleContext' | 'propagateServerField' | 'getServerField'>;
+export interface LazyRenderServerInstance {
+    instance?: RenderServer;
+}
+export declare function initialize(opts: {
+    dir: string;
+    port: number;
+    dev: boolean;
+    onDevServerCleanup: ((listener: () => Promise<void>) => void) | undefined;
+    server?: import('http').Server;
+    minimalMode?: boolean;
+    hostname?: string;
+    keepAliveTimeout?: number;
+    customServer?: boolean;
+    experimentalHttpsServer?: boolean;
+    startServerSpan?: Span;
+    quiet?: boolean;
+}): Promise<ServerInitResult>;