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/response-cache/utils.d.ts

@@ -0,0 +1,5 @@
+import { IncrementalCacheKind, type IncrementalResponseCacheEntry, type ResponseCacheEntry } from './types';
+import { RouteKind } from '../route-kind';
+export declare function fromResponseCacheEntry(cacheEntry: ResponseCacheEntry): Promise<IncrementalResponseCacheEntry>;
+export declare function toResponseCacheEntry(response: IncrementalResponseCacheEntry | null): Promise<ResponseCacheEntry | null>;
+export declare function routeKindToIncrementalCacheKind(routeKind: RouteKind): Exclude<IncrementalCacheKind, IncrementalCacheKind.FETCH>;