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/schemas.py

@@ -496,57 +496,6 @@ class SeedResponse(BaseModel):
     counts: Dict[str, int]
 
 
-# ============================================================================
-# PDF Extraction Schemas
-# ============================================================================
-
-class BSIAspectResponse(BaseModel):
-    """Response schema for an extracted BSI-TR Pruefaspekt."""
-    aspect_id: str
-    title: str
-    full_text: str
-    category: str
-    page_number: int
-    section: str
-    requirement_level: str
-    source_document: str
-    keywords: List[str] = []
-    related_aspects: List[str] = []
-
-
-class PDFExtractionResponse(BaseModel):
-    """Response for PDF extraction operation."""
-    success: bool
-    source_document: str
-    total_aspects: int
-    aspects: List[BSIAspectResponse]
-    statistics: Dict[str, Any]
-    requirements_created: int = 0
-
-
-class PDFExtractionRequest(BaseModel):
-    """Request to extract requirements from a PDF."""
-    document_code: str  # e.g., "BSI-TR-03161-2"
-    save_to_db: bool = True
-    force: bool = False
-
-
-# ============================================================================
-# Paginated Response Schemas (after all Response classes are defined)
-# ============================================================================
-
-class PaginatedRequirementResponse(BaseModel):
-    """Paginated response for requirements."""
-    data: List[RequirementResponse]
-    pagination: PaginationMeta
-
-
-class PaginatedControlResponse(BaseModel):
-    """Paginated response for controls."""
-    data: List[ControlResponse]
-    pagination: PaginationMeta
-
-
 class PaginatedEvidenceResponse(BaseModel):
     """Paginated response for evidence."""
     data: List[EvidenceResponse]