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/components/app-router-instance.d.ts

@@ -0,0 +1,36 @@
+import { type AppRouterState, type ReducerActions, type ReducerState, type NavigateAction, type AppHistoryState } from './router-reducer/router-reducer-types';
+import type { AppRouterInstance } from '../../shared/lib/app-router-context.shared-runtime';
+import { type LinkInstance } from './links';
+import type { ClientInstrumentationHooks } from '../app-index';
+import type { GlobalErrorComponent } from './builtin/global-error';
+export type DispatchStatePromise = React.Dispatch<ReducerState>;
+export type AppRouterActionQueue = {
+    state: AppRouterState;
+    dispatch: (payload: ReducerActions, setState: DispatchStatePromise) => void;
+    action: (state: AppRouterState, action: ReducerActions) => ReducerState;
+    onRouterTransitionStart: ((url: string, type: 'push' | 'replace' | 'traverse') => void) | null;
+    pending: ActionQueueNode | null;
+    needsRefresh?: boolean;
+    last: ActionQueueNode | null;
+};
+export type GlobalErrorState = [
+    GlobalError: GlobalErrorComponent,
+    styles: React.ReactNode
+];
+export type ActionQueueNode = {
+    payload: ReducerActions;
+    next: ActionQueueNode | null;
+    resolve: (value: ReducerState) => void;
+    reject: (err: Error) => void;
+    discarded?: boolean;
+};
+export declare function createMutableActionQueue(initialState: AppRouterState, instrumentationHooks: ClientInstrumentationHooks | null): AppRouterActionQueue;
+export declare function getCurrentAppRouterState(): AppRouterState | null;
+export declare function dispatchNavigateAction(href: string, navigateType: NavigateAction['navigateType'], shouldScroll: boolean, linkInstanceRef: LinkInstance | null): void;
+export declare function dispatchTraverseAction(href: string, historyState: AppHistoryState | undefined): void;
+/**
+ * The app router that is exposed through `useRouter`. These are public API
+ * methods. Internal Next.js code should call the lower level methods directly
+ * (although there's lots of existing code that doesn't do that).
+ */
+export declare const publicAppRouterInstance: AppRouterInstance;