fix(quality): Ruff/CVE/TS-Fixes, 104 neue Tests, Complexity-Refactoring

- Ruff: 144 auto-fixes (unused imports, == None → is None), F821/F811/F841 manuell
- CVEs: python-multipart>=0.0.22, weasyprint>=68.0, pillow>=12.1.1, npm audit fix (0 vulns)
- TS: 5 tote Drafting-Engine-Dateien entfernt, allowed-facts/sanitizer/StepHeader/context fixes
- Tests: +104 (ISMS 58, Evidence 18, VVT 14, Generation 14) → 1449 passed
- Refactoring: collect_ci_evidence (F→A), row_to_response (E→A), extract_requirements (E→A)
- Dead Code: pca-platform, 7 Go-Handler, dsr_api.py, duplicate Schemas entfernt

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

backend-compliance/compliance/api/email_template_routes.py

@@ -6,14 +6,12 @@ Inklusive Versionierung, Approval-Workflow, Vorschau und Send-Logging.
 """
 
 import uuid
-import re
 from datetime import datetime
-from typing import Optional, List, Dict, Any
+from typing import Optional, Dict
 
 from fastapi import APIRouter, Depends, HTTPException, Query, Header
 from pydantic import BaseModel
 from sqlalchemy.orm import Session
-from sqlalchemy import func
 
 from classroom_engine.database import get_db
 from ..db.email_template_models import (
@@ -182,7 +180,7 @@ async def get_stats(
     base = db.query(EmailTemplateDB).filter(EmailTemplateDB.tenant_id == tid)
 
     total = base.count()
-    active = base.filter(EmailTemplateDB.is_active == True).count()
+    active = base.filter(EmailTemplateDB.is_active).count()
 
     # Count templates with published versions
     published_count = 0