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/web/utils.d.ts

@@ -0,0 +1,29 @@
+import type { OutgoingHttpHeaders } from 'http';
+/**
+ * Converts a Node.js IncomingHttpHeaders object to a Headers object. Any
+ * headers with multiple values will be joined with a comma and space. Any
+ * headers that have an undefined value will be ignored and others will be
+ * coerced to strings.
+ *
+ * @param nodeHeaders the headers object to convert
+ * @returns the converted headers object
+ */
+export declare function fromNodeOutgoingHttpHeaders(nodeHeaders: OutgoingHttpHeaders): Headers;
+export declare function splitCookiesString(cookiesString: string): string[];
+/**
+ * Converts a Headers object to a Node.js OutgoingHttpHeaders object. This is
+ * required to support the set-cookie header, which may have multiple values.
+ *
+ * @param headers the headers object to convert
+ * @returns the converted headers object
+ */
+export declare function toNodeOutgoingHttpHeaders(headers: Headers): OutgoingHttpHeaders;
+/**
+ * Validate the correctness of a user-provided URL.
+ */
+export declare function validateURL(url: string | URL): string;
+/**
+ * Normalizes `nxtP` and `nxtI` query param values to remove the prefix.
+ * This function does not mutate the input key.
+ */
+export declare function normalizeNextQueryParam(key: string): null | string;