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/load-manifest.external.d.ts

@@ -0,0 +1,29 @@
+import type { DeepReadonly } from '../shared/lib/deep-readonly';
+/**
+ * Load a manifest file from the file system. Optionally cache the manifest in
+ * memory to avoid reading the file multiple times using the provided cache or
+ * defaulting to a shared module cache. The manifest is frozen to prevent
+ * modifications if it is cached.
+ *
+ * @param path the path to the manifest file
+ * @param shouldCache whether to cache the manifest in memory
+ * @param cache the cache to use for storing the manifest
+ * @returns the manifest object
+ */
+export declare function loadManifest<T extends object>(path: string, shouldCache: false): T;
+export declare function loadManifest<T extends object>(path: string, shouldCache?: boolean, cache?: Map<string, unknown>, skipParse?: boolean): DeepReadonly<T>;
+export declare function loadManifest<T extends object>(path: string, shouldCache?: true, cache?: Map<string, unknown>, skipParse?: boolean): DeepReadonly<T>;
+export declare function evalManifest<T extends object>(path: string, shouldCache: false): T;
+export declare function evalManifest<T extends object>(path: string, shouldCache?: boolean, cache?: Map<string, unknown>): DeepReadonly<T>;
+export declare function evalManifest<T extends object>(path: string, shouldCache?: true, cache?: Map<string, unknown>): DeepReadonly<T>;
+export declare function loadManifestFromRelativePath<T extends object>({ projectDir, distDir, manifest, shouldCache, cache, skipParse, handleMissing, useEval, }: {
+    projectDir: string;
+    distDir: string;
+    manifest: string;
+    shouldCache?: boolean;
+    cache?: Map<string, unknown>;
+    skipParse?: boolean;
+    handleMissing?: boolean;
+    useEval?: boolean;
+}): DeepReadonly<T>;
+export declare function clearManifestCache(path: string, cache?: Map<string, unknown>): boolean;