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/compiled/source-map/LICENSE

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+
+Copyright (c) 2009-2011, Mozilla Foundation and contributors
+All rights reserved.
+
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+  this list of conditions and the following disclaimer in the documentation
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apps/public-web/node_modules/next/dist/compiled/source-map/package.json

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+{"name":"source-map","main":"source-map.js","author":"Nick Fitzgerald <nfitzgerald@mozilla.com>","license":"BSD-3-Clause"}