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/font/index.d.ts

@@ -0,0 +1,30 @@
+export type AdjustFontFallback = {
+  fallbackFont: string
+  ascentOverride?: string
+  descentOverride?: string
+  lineGapOverride?: string
+  sizeAdjust?: string
+}
+
+export type FontLoader = (options: {
+  functionName: string
+  variableName: string
+  data: any[]
+  emitFontFile: (
+    content: Buffer,
+    ext: string,
+    preload: boolean,
+    isUsingSizeAdjust?: boolean
+  ) => string
+  resolve: (src: string) => string
+  isDev: boolean
+  isServer: boolean
+  loaderContext: any
+}) => Promise<{
+  css: string
+  fallbackFonts?: string[]
+  variable?: string
+  adjustFontFallback?: AdjustFontFallback
+  weight?: string
+  style?: string
+}>