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/cache.js

@@ -0,0 +1,63 @@
+const cacheExports = {
+  unstable_cache: require('next/dist/server/web/spec-extension/unstable-cache')
+    .unstable_cache,
+
+  updateTag: require('next/dist/server/web/spec-extension/revalidate')
+    .updateTag,
+
+  revalidateTag: require('next/dist/server/web/spec-extension/revalidate')
+    .revalidateTag,
+  revalidatePath: require('next/dist/server/web/spec-extension/revalidate')
+    .revalidatePath,
+
+  refresh: require('next/dist/server/web/spec-extension/revalidate').refresh,
+
+  unstable_noStore:
+    require('next/dist/server/web/spec-extension/unstable-no-store')
+      .unstable_noStore,
+  cacheLife: require('next/dist/server/use-cache/cache-life').cacheLife,
+  cacheTag: require('next/dist/server/use-cache/cache-tag').cacheTag,
+}
+
+let didWarnCacheLife = false
+function unstable_cacheLife() {
+  if (!didWarnCacheLife) {
+    didWarnCacheLife = true
+    const error = new Error(
+      '`unstable_cacheLife` was recently stabilized and should be imported as `cacheLife`. The `unstable` prefixed form will be removed in a future version of Next.js.'
+    )
+    console.error(error)
+  }
+  return cacheExports.cacheLife.apply(this, arguments)
+}
+
+let didWarnCacheTag = false
+function unstable_cacheTag() {
+  if (!didWarnCacheTag) {
+    didWarnCacheTag = true
+    const error = new Error(
+      '`unstable_cacheTag` was recently stabilized and should be imported as `cacheTag`. The `unstable` prefixed form will be removed in a future version of Next.js.'
+    )
+    console.error(error)
+  }
+  return cacheExports.cacheTag.apply(this, arguments)
+}
+
+cacheExports.unstable_cacheLife = unstable_cacheLife
+cacheExports.unstable_cacheTag = unstable_cacheTag
+
+// https://nodejs.org/api/esm.html#commonjs-namespaces
+// When importing CommonJS modules, the module.exports object is provided as the default export
+module.exports = cacheExports
+
+// make import { xxx } from 'next/cache' work
+exports.unstable_cache = cacheExports.unstable_cache
+exports.revalidatePath = cacheExports.revalidatePath
+exports.revalidateTag = cacheExports.revalidateTag
+exports.updateTag = cacheExports.updateTag
+exports.unstable_noStore = cacheExports.unstable_noStore
+exports.cacheLife = cacheExports.cacheLife
+exports.unstable_cacheLife = cacheExports.unstable_cacheLife
+exports.cacheTag = cacheExports.cacheTag
+exports.unstable_cacheTag = cacheExports.unstable_cacheTag
+exports.refresh = cacheExports.refresh