feat: add compliance modules 2-5 (dashboard, security templates, process manager, evidence collector)

Module 2: Extended Compliance Dashboard with roadmap, module-status, next-actions, snapshots, score-history
Module 3: 7 German security document templates (IT-Sicherheitskonzept, Datenschutz, Backup, Logging, Incident-Response, Zugriff, Risikomanagement)
Module 4: Compliance Process Manager with CRUD, complete/skip/seed, ~50 seed tasks, 3-tab UI
Module 5: Evidence Collector Extended with automated checks, control-mapping, coverage report, 4-tab UI

Also includes: canonical control library enhancements (verification method, categories, dedup), control generator improvements, RAG client extensions

52 tests pass, frontend builds clean.

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

backend-compliance/compliance/api/legal_template_routes.py

@@ -50,6 +50,14 @@ VALID_DOCUMENT_TYPES = {
     "cookie_banner",
     "agb",
     "clause",
+    # Security document templates (Migration 051)
+    "it_security_concept",
+    "data_protection_concept",
+    "backup_recovery_concept",
+    "logging_concept",
+    "incident_response_plan",
+    "access_control_concept",
+    "risk_management_concept",
 }
 VALID_STATUSES = {"published", "draft", "archived"}