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/action-handler.d.ts

@@ -0,0 +1,42 @@
+import type { IncomingHttpHeaders } from 'node:http';
+import type { SizeLimit } from '../../types';
+import type { RequestStore } from '../app-render/work-unit-async-storage.external';
+import type { AppRenderContext, GenerateFlight } from './app-render';
+import type { AppPageModule } from '../route-modules/app-page/module';
+import type { BaseNextRequest, BaseNextResponse } from '../base-http';
+import RenderResult, { type AppPageRenderResultMetadata } from '../render-result';
+import type { WorkStore } from '../app-render/work-async-storage.external';
+declare const enum HostType {
+    XForwardedHost = "x-forwarded-host",
+    Host = "host"
+}
+export declare function parseHostHeader(headers: IncomingHttpHeaders, originDomain?: string): {
+    type: HostType;
+    value: string;
+} | undefined;
+type ServerActionsConfig = {
+    bodySizeLimit?: SizeLimit;
+    allowedOrigins?: string[];
+};
+type HandleActionResult = {
+    /** An MPA action threw notFound(), and we need to render the appropriate HTML */
+    type: 'not-found';
+} | {
+    type: 'done';
+    result: RenderResult | undefined;
+    formState?: any;
+}
+/** The request turned out not to be a server action. */
+ | null;
+export declare function handleAction({ req, res, ComponentMod, generateFlight, workStore, requestStore, serverActions, ctx, metadata, }: {
+    req: BaseNextRequest;
+    res: BaseNextResponse;
+    ComponentMod: AppPageModule;
+    generateFlight: GenerateFlight;
+    workStore: WorkStore;
+    requestStore: RequestStore;
+    serverActions?: ServerActionsConfig;
+    ctx: AppRenderContext;
+    metadata: AppPageRenderResultMetadata;
+}): Promise<HandleActionResult>;
+export {};