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/web.d.ts

@@ -0,0 +1,20 @@
+import type { ResponseCacheEntry, ResponseGenerator } from './types';
+/**
+ * In the web server, there is currently no incremental cache provided and we
+ * always SSR the page.
+ */
+export default class WebResponseCache {
+    pendingResponses: Map<string, Promise<ResponseCacheEntry | null>>;
+    previousCacheItem?: {
+        key: string;
+        entry: ResponseCacheEntry | null;
+        expiresAt: number;
+    };
+    minimalMode?: boolean;
+    constructor(minimalMode: boolean);
+    get(key: string | null, responseGenerator: ResponseGenerator, context: {
+        isOnDemandRevalidate?: boolean;
+        isPrefetch?: boolean;
+        incrementalCache: any;
+    }): Promise<ResponseCacheEntry | null>;
+}