fix(escalations): Tenant/User-ID Defaults + Routing-Klarheit

- escalations/route.ts: X-Tenant-Id + X-User-Id Default-Header ergaenzt,
  X-User-Id aus Request weitergeleitet
- escalation_routes.py: DEFAULT_TENANT_ID Konstante (9282a473-...) statt 'default'
- test_escalation_routes.py: vollstaendige Test-Suite ergaenzt (+337 Zeilen)
- main.go + escalation_handlers.go: DEPRECATED-Kommentare — UCCA-Escalations
  bleiben fuer Assessment-Review, Haupt-Escalation-System ist Python-Backend

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

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

@@ -345,7 +345,9 @@ func main() {
 			uccaRoutes.GET("/wizard/schema", uccaHandlers.GetWizardSchema)
 			uccaRoutes.POST("/wizard/ask", uccaHandlers.AskWizardQuestion)
 
-			// Escalation management (E0-E3 workflow)
+			// DEPRECATED: UCCA Escalation management (E0-E3 workflow)
+			// Frontend uses Python backend-compliance escalation_routes.py (/api/compliance/escalations).
+			// These UCCA-specific routes remain for assessment-review workflows only.
 			uccaRoutes.GET("/escalations", escalationHandlers.ListEscalations)
 			uccaRoutes.GET("/escalations/stats", escalationHandlers.GetEscalationStats)
 			uccaRoutes.GET("/escalations/:id", escalationHandlers.GetEscalation)
@@ -354,7 +356,7 @@ func main() {
 			uccaRoutes.POST("/escalations/:id/review", escalationHandlers.StartReview)
 			uccaRoutes.POST("/escalations/:id/decide", escalationHandlers.DecideEscalation)
 
-			// DSB Pool management
+			// DEPRECATED: DSB Pool management — see note above
 			uccaRoutes.GET("/dsb-pool", escalationHandlers.ListDSBPool)
 			uccaRoutes.POST("/dsb-pool", escalationHandlers.AddDSBPoolMember)
 

ai-compliance-sdk/internal/api/handlers/escalation_handlers.go

@@ -1,3 +1,7 @@
+// DEPRECATED: This file implements UCCA-specific escalation handlers (E0-E3 workflow).
+// The primary escalation system is now Python backend-compliance escalation_routes.py
+// (/api/compliance/escalations). These UCCA handlers remain only for assessment-review
+// workflows and will be removed in a future release.
 package handlers
 
 import (