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/next-devtools/server/middleware-response.d.ts

@@ -0,0 +1,10 @@
+import type { ServerResponse } from 'http';
+export declare const middlewareResponse: {
+    noContent(res: ServerResponse): void;
+    badRequest(res: ServerResponse, reason?: string): void;
+    notFound(res: ServerResponse): void;
+    methodNotAllowed(res: ServerResponse): void;
+    internalServerError(res: ServerResponse, error?: unknown): void;
+    json(res: ServerResponse, data: any): void;
+    jsonString(res: ServerResponse, data: string): void;
+};