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/route-matches/pages-api-route-match.d.ts

@@ -0,0 +1,10 @@
+import type { RouteMatch } from './route-match';
+import type { PagesAPIRouteDefinition } from '../route-definitions/pages-api-route-definition';
+export interface PagesAPIRouteMatch extends RouteMatch<PagesAPIRouteDefinition> {
+}
+/**
+ * Checks if the given match is a Pages API route match.
+ * @param match the match to check
+ * @returns true if the match is a Pages API route match, false otherwise
+ */
+export declare function isPagesAPIRouteMatch(match: RouteMatch): match is PagesAPIRouteMatch;