Add architecture spec and implementation plan

Transcribe the original architecture PDF into SPEZIFIKATION.md and add
UMSETZUNGSPLAN.md with the refined implementation plan (ZUGFeRD on-the-fly
invoicing, uv + Docker Compose, grouped Leistungserfassung).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Matthias Mintert
2026-07-11 00:22:16 +02:00
commit 7b60be2933
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Architektur_Planung_Abrechnungssystem.pdf
.idea/