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/use-cache/cache-life.d.ts

@@ -0,0 +1,8 @@
+export type CacheLife = {
+    stale?: number;
+    revalidate?: number;
+    expire?: number;
+};
+type CacheLifeProfiles = 'default' | 'seconds' | 'minutes' | 'hours' | 'days' | 'weeks' | 'max' | (string & {});
+export declare function cacheLife(profile: CacheLifeProfiles | CacheLife): void;
+export {};