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/client/dev/debug-channel.d.ts

@@ -0,0 +1,9 @@
+export interface DebugChannelReadableWriterPair {
+    readonly readable: ReadableStream<Uint8Array>;
+    readonly writer: WritableStreamDefaultWriter<Uint8Array>;
+}
+export declare function getOrCreateDebugChannelReadableWriterPair(requestId: string): DebugChannelReadableWriterPair;
+export declare function createDebugChannel(requestHeaders: Record<string, string> | undefined): {
+    writable?: WritableStream;
+    readable?: ReadableStream;
+};