Sportheim mieten: Buchungsseite mit Anfrageformular

Neue Seite /sportheimbuchung mit Bento-Layout (Fotos, Lage, Ausstattung) und
einem Buchungsanfrage-Formular nach Projektkonvention (form-field-Komponente,
Status-Region, Honeypot + ft-Token, Whitelist-Validierung, Rate-Limiting, PRG).
Versand via Brevo SMTP über app/actions/sportheimbuchung-senden.php, POST-Route
in index.php. form-field um min/max-Attribute erweitert (Personenzahl-Feld).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HGzc6GhWhmLJt1jC2q1SRZ

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