feat: Gebührentabellen — interactive fee schedule reference
Browsable, interactive fee tables for GKG, RVG, UPC, EPA, and PatKostG:
- New page at /tools/gebuehrentabellen with tabbed view
- API endpoint GET /api/tools/gebuehrentabellen returns all fee data
- Lookup endpoint GET /api/tools/gebuehrentabellen/lookup?streitwert=X
- GKG/RVG tables with version pills (2005, 2013, 2021, 2025/Aktuell)
- Streitwert input for quick lookup — highlights matching row
- UPC fee schedule (pre-2026 vs 2026) with fixed fees, value-based
fees, recoverable costs ceiling, and SME reduction display
- EPA fees (opposition, appeal, grant, examination, search, filing)
- PatKostG tab with BPatG/BGH court fee factors, DPMA fees, and
patent annual renewal fees (years 3-20)
- Common multipliers reference table (court fee factors, RA/PA VG/TG)
- Feedback modal with Supabase storage (gebuehrentabellen_feedback)
- Full DE/EN i18n, responsive layout, print-friendly
- Added to sidebar nav, landing page tools section, build pipeline
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