v0.1.0

🚀 What’s in this Release:

• 🆔 Added optional id field (introduced in api-docs v1.2.3.9 on 2025-08-13):
  • Parse id (string|null) from API responses.
  • New getter getId(): ?string.
  • Include id in toArray() serialization output.
• 💔 Renamed checkAvailability() to getAvailability()
• 🛠️ Refactored request, throw ErrorResponse when anfrageZeitpunkt or status key is missing, passed PHPStan level 9, added unified error handling, increased test coverage, tackled TODOs in code, removed obsolete comments.
• 📝 Updated documentation.

PRs

• chore: quality by @zembrowski in #2
• feat: add id in response by @zembrowski in #3

Full Changelog: v0.0.2...v0.1.0