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/build/get-static-info-including-layouts.d.ts

@@ -0,0 +1,12 @@
+import type { NextConfigComplete } from '../server/config-shared';
+import type { PageStaticInfo } from './analysis/get-page-static-info';
+import type { PageExtensions } from './page-extensions-type';
+export declare function getStaticInfoIncludingLayouts({ isInsideAppDir, pageExtensions, pageFilePath, appDir, config: nextConfig, isDev, page, }: {
+    isInsideAppDir: boolean;
+    pageExtensions: PageExtensions;
+    pageFilePath: string;
+    appDir: string | undefined;
+    config: NextConfigComplete;
+    isDev: boolean;
+    page: string;
+}): Promise<PageStaticInfo>;