feat(dsfa): Go DSFA deprecated, URL-Fix, fehlende Endpoints + 145 Tests

- Go: DEPRECATED-Kommentare an allen 6 DSFA-Handlern + Route-Block
- api.ts: URL-Fix /dsgvo/dsfas → /dsfa (Detail-Seite war komplett kaputt)
- Python: Section-Update, Workflow (submit/approve), Export (JSON+CSV), UCCA-Stubs
- Tests: 145/145 bestanden (Schema + Route-Integration mit TestClient+SQLite)

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

ai-compliance-sdk/cmd/server/main.go

@@ -291,6 +291,8 @@ func main() {
 			}
 
 			// DSFA - Datenschutz-Folgenabschätzung (Art. 35)
+			// DEPRECATED: DSFA migrated to backend-compliance (Python/FastAPI).
+			// Use backend-compliance /api/compliance/dsfa/* instead.
 			dsfa := dsgvoRoutes.Group("/dsfa")
 			{
 				dsfa.GET("", dsgvoHandlers.ListDSFAs)