feat: vollständiges Datenmodell für Normen und Entscheidungen (AIIA-15)
Replaces placeholder schema with full legal data model:
- Normen with temporal versioning (valid_from/valid_to), source rank hierarchy,
immutable version chains, and norm-to-norm cross-references
- Entscheidungen with structured metadata (Aktenzeichen, Gremium, Leitsatz,
Tenor, Tatbestand, Entscheidungsgründe), decision-norm links with Stichtag
- NV Bühne Fachgruppen and BSchGO Arbitration Tribunals
- Cases, Analyses, and DSGVO Audit Log
- Mandantentrennung via tenant_id + PostgreSQL Row-Level Security policies
- Initial Drizzle migration and RLS migration
Co-Authored-By: Paperclip <noreply@paperclip.ing>
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