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/request/search-params.d.ts

@@ -0,0 +1,14 @@
+import type { WorkStore } from '../app-render/work-async-storage.external';
+export type SearchParams = {
+    [key: string]: string | string[] | undefined;
+};
+export declare function createSearchParamsFromClient(underlyingSearchParams: SearchParams, workStore: WorkStore): Promise<SearchParams>;
+export declare const createServerSearchParamsForMetadata: typeof createServerSearchParamsForServerPage;
+export declare function createServerSearchParamsForServerPage(underlyingSearchParams: SearchParams, workStore: WorkStore): Promise<SearchParams>;
+export declare function createPrerenderSearchParamsForClientPage(workStore: WorkStore): Promise<SearchParams>;
+/**
+ * This is a variation of `makeErroringSearchParams` that always throws an
+ * error on access, because accessing searchParams inside of `"use cache"` is
+ * not allowed.
+ */
+export declare function makeErroringSearchParamsForUseCache(workStore: WorkStore): Promise<SearchParams>;