Mitmachen: Ehrenamtsseite mit Stellen-Filter

Neue Seite /mitmachen, die offene Ehrenamtsstellen aus data/mitmachen.json als
position-card-Komponente listet, mit clientseitigem Bereichsfilter
(position-filter.js, progressive enhancement) und JobPosting-Schema
(job_posting_schema(), employmentType VOLUNTEER). Route ergänzt.
Enthält zudem kleine person-card__contact-Stilanpassungen (gleiche CSS-Sektion).

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

public/assets/icons/check2.svg

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public/assets/icons/clipboard-check.svg

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public/assets/icons/clock-history.svg

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public/assets/icons/cup-hot.svg

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