Implements website feature branch `407-msp-mittelstand-use-case-pages` into `website-dev`.
Summary:
- add German and English MSP and internal IT use-case landing pages
- expose localized buyer-path teasers from the homepage and platform page
- extend smoke coverage for the new routes, navigation links, metadata, and conservative claim checks
- include the aligned Spec Kit artifacts under `specs/407-msp-mittelstand-use-case-pages`
Validation:
- `cd apps/website && corepack pnpm build`
- `cd apps/website && corepack pnpm test -- tests/smoke/public-routes.spec.ts tests/smoke/interaction.spec.ts`
Follow-up integration path after merge:
`website-dev` -> `dev`.
Co-authored-by: Ahmed Darrazi <ahmed.darrazi@live.de>
Reviewed-on: #402
ahmido
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