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/middleware/__init__.py

@@ -4,23 +4,13 @@ BreakPilot Middleware Stack
 This module provides middleware components for the FastAPI backend:
 - Request-ID: Adds unique request identifiers for tracing
 - Security Headers: Adds security headers to all responses
-- Rate Limiter: Protects against abuse (Valkey-based)
-- PII Redactor: Redacts sensitive data from logs
-- Input Gate: Validates request body size and content types
 """
 
 from .request_id import RequestIDMiddleware, get_request_id
 from .security_headers import SecurityHeadersMiddleware
-from .rate_limiter import RateLimiterMiddleware
-from .pii_redactor import PIIRedactor, redact_pii
-from .input_gate import InputGateMiddleware
 
 __all__ = [
     "RequestIDMiddleware",
     "get_request_id",
     "SecurityHeadersMiddleware",
-    "RateLimiterMiddleware",
-    "PIIRedactor",
-    "redact_pii",
-    "InputGateMiddleware",
 ]