docs(wiki): Update all wiki pages to v0.2.1 with bilingual content

- Home.md: Added v0.2.1 features, updated status table, bilingual (DE/EN)
- Installation.md: Complete setup guide for production & development, bilingual
- Development.md: Developer guidelines, code standards, workflow, bilingual
- FAQ.md: Comprehensive FAQ section, bilingual

Changes:
✅ Updated v0.2.1 features (API docs, bundle optimization)
✅ Added bilingual content for all pages
✅ Improved code examples and troubleshooting
✅ Updated links to latest documentation
✅ Consistent formatting across all wiki pages

Author: Stefan