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/app-render/walk-tree-with-flight-router-state.d.ts

@@ -0,0 +1,24 @@
+import type { FlightDataPath, FlightRouterState, HeadData } from '../../shared/lib/app-router-types';
+import type { PreloadCallbacks } from './types';
+import type { LoaderTree } from '../lib/app-dir-module';
+import type { AppRenderContext } from './app-render';
+/**
+ * Use router state to decide at what common layout to render the page.
+ * This can either be the common layout between two pages or a specific place to start rendering from using the "refetch" marker in the tree.
+ */
+export declare function walkTreeWithFlightRouterState({ loaderTreeToFilter, parentParams, flightRouterState, parentIsInsideSharedLayout, rscHead, injectedCSS, injectedJS, injectedFontPreloadTags, rootLayoutIncluded, ctx, preloadCallbacks, MetadataOutlet, }: {
+    loaderTreeToFilter: LoaderTree;
+    parentParams: {
+        [key: string]: string | string[];
+    };
+    flightRouterState?: FlightRouterState;
+    rscHead: HeadData;
+    parentIsInsideSharedLayout?: boolean;
+    injectedCSS: Set<string>;
+    injectedJS: Set<string>;
+    injectedFontPreloadTags: Set<string>;
+    rootLayoutIncluded: boolean;
+    ctx: AppRenderContext;
+    preloadCallbacks: PreloadCallbacks;
+    MetadataOutlet: React.ComponentType;
+}): Promise<FlightDataPath[]>;