feat: DSFA Section 8 KI-Anwendungsfälle + Bundesland RAG-Ingest

- Migration 028: ai_use_case_modules JSONB + section_8_complete auf compliance_dsfas
- Neues ai-use-case-types.ts: AIUseCaseModule Interface, 8 Typen, Art22Assessment,
  AI Act Risikoklassen, WP248-Kriterien, Privacy by Design, createEmptyModule() Helper
- types.ts: Section 8 in DSFA_SECTIONS, ai_use_case_modules im DSFA Interface,
  section_8_complete in DSFASectionProgress
- api.ts: addAIUseCaseModule, updateAIUseCaseModule, removeAIUseCaseModule
- 5 neue UI-Komponenten: AIUseCaseTypeSelector, Art22AssessmentPanel,
  AIRiskCriteriaChecklist, AIUseCaseModuleEditor (7 Tabs), AIUseCaseSection
- DSFASidebar: Section 8 Eintrag + calculateSectionProgress case 8
- ReviewScheduleSection: ai_use_case_module Trigger-Typ ergänzt
- page.tsx: Section 8 Rendering + Weiter-Button auf activeSection < 8 + KI-Module Counter
- scripts/ingest-dsfa-bundesland.sh: WP248 + alle 17 Behörden → bp_dsfa_corpus
- Docs: dsfa.md Section 8 + RAG-Corpus, Developer Portal DSFA mit AI-Modul-Code-Beispielen

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend-compliance/migrations/028_dsfa_ai_use_cases.sql

@@ -0,0 +1,12 @@
+-- Migration 028: DSFA AI Use Cases
+-- Adds ai_use_case_modules (JSONB) and section_8_complete (BOOLEAN) to compliance_dsfas
+
+ALTER TABLE compliance.compliance_dsfas
+  ADD COLUMN IF NOT EXISTS ai_use_case_modules JSONB DEFAULT '[]'::jsonb,
+  ADD COLUMN IF NOT EXISTS section_8_complete BOOLEAN DEFAULT FALSE;
+
+-- Extend section_progress JSONB for existing rows
+UPDATE compliance.compliance_dsfas
+SET section_progress = section_progress || '{"section_8_complete": false}'::jsonb
+WHERE section_progress IS NOT NULL
+  AND NOT (section_progress ? 'section_8_complete');