refactor(backend/api): split schemas.py into per-domain modules (1899 -> 39 LOC shim)

Phase 1 Step 3 of PHASE1_RUNBOOK.md. compliance/api/schemas.py is
decomposed into 16 per-domain Pydantic schema modules under
compliance/schemas/:

  common.py          ( 79) — 6 API enums + PaginationMeta
  regulation.py      ( 52)
  requirement.py     ( 80)
  control.py         (119) — Control + Mapping
  evidence.py        ( 66)
  risk.py            ( 79)
  ai_system.py       ( 63)
  dashboard.py       (195) — Dashboard, Export, Executive Dashboard
  service_module.py  (121)
  bsi.py             ( 58) — BSI + PDF extraction
  audit_session.py   (172)
  report.py          ( 53)
  isms_governance.py (343) — Scope, Context, Policy, Objective, SoA
  isms_audit.py      (431) — Finding, CAPA, Review, Internal Audit, Readiness, Trail, ISO27001
  vvt.py             (168)
  tom.py             ( 71)

compliance/api/schemas.py becomes a 39-line re-export shim so existing
imports (from compliance.api.schemas import RegulationResponse) keep
working unchanged. New code should import from the domain module
directly (from compliance.schemas.regulation import RegulationResponse).

Deferred-from-sweep: all 28 class Config blocks in the original file
were converted to model_config = ConfigDict(...) during the split.
schemas.py-sourced PydanticDeprecatedSince20 warnings are now gone.

Cross-domain references handled via targeted imports (e.g. dashboard.py
imports EvidenceResponse from evidence, RiskResponse from risk). common
API enums + PaginationMeta are imported by every domain module.

Verified:
  - 173/173 pytest compliance/tests/ tests/contracts/ pass
  - OpenAPI 360 paths / 484 operations unchanged (contract test green)
  - All new files under the 500-line hard cap (largest: isms_audit.py
    at 431, isms_governance.py at 343, dashboard.py at 195)
  - No file in compliance/schemas/ or compliance/api/schemas.py
    exceeds the hard cap

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend-compliance/compliance/schemas/vvt.py

@@ -0,0 +1,168 @@
+"""
+VVT (Verzeichnis von Verarbeitungstätigkeiten) Pydantic schemas — extracted from compliance/api/schemas.py.
+
+Phase 1 Step 3: the monolithic ``compliance.api.schemas`` module is being
+split per domain under ``compliance.schemas``. This module is re-exported
+from ``compliance.api.schemas`` for backwards compatibility.
+"""
+
+from datetime import datetime, date
+from typing import Optional, List, Any, Dict
+
+from pydantic import BaseModel, ConfigDict, Field
+
+from compliance.schemas.common import (
+    PaginationMeta, RegulationType, ControlType, ControlDomain,
+    ControlStatus, RiskLevel, EvidenceStatus,
+)
+
+
+# ============================================================================
+# VVT Schemas — Verzeichnis von Verarbeitungstaetigkeiten (Art. 30 DSGVO)
+# ============================================================================
+
+class VVTOrganizationUpdate(BaseModel):
+    organization_name: Optional[str] = None
+    industry: Optional[str] = None
+    locations: Optional[List[str]] = None
+    employee_count: Optional[int] = None
+    dpo_name: Optional[str] = None
+    dpo_contact: Optional[str] = None
+    vvt_version: Optional[str] = None
+    last_review_date: Optional[date] = None
+    next_review_date: Optional[date] = None
+    review_interval: Optional[str] = None
+
+
+class VVTOrganizationResponse(BaseModel):
+    id: str
+    organization_name: str
+    industry: Optional[str] = None
+    locations: List[Any] = []
+    employee_count: Optional[int] = None
+    dpo_name: Optional[str] = None
+    dpo_contact: Optional[str] = None
+    vvt_version: str = '1.0'
+    last_review_date: Optional[date] = None
+    next_review_date: Optional[date] = None
+    review_interval: str = 'annual'
+    created_at: datetime
+    updated_at: Optional[datetime] = None
+
+    model_config = ConfigDict(from_attributes=True)
+
+
+class VVTActivityCreate(BaseModel):
+    vvt_id: str
+    name: str
+    description: Optional[str] = None
+    purposes: List[str] = []
+    legal_bases: List[str] = []
+    data_subject_categories: List[str] = []
+    personal_data_categories: List[str] = []
+    recipient_categories: List[str] = []
+    third_country_transfers: List[Any] = []
+    retention_period: Dict[str, Any] = {}
+    tom_description: Optional[str] = None
+    business_function: Optional[str] = None
+    systems: List[str] = []
+    deployment_model: Optional[str] = None
+    data_sources: List[Any] = []
+    data_flows: List[Any] = []
+    protection_level: str = 'MEDIUM'
+    dpia_required: bool = False
+    structured_toms: Dict[str, Any] = {}
+    status: str = 'DRAFT'
+    responsible: Optional[str] = None
+    owner: Optional[str] = None
+    last_reviewed_at: Optional[datetime] = None
+    next_review_at: Optional[datetime] = None
+    created_by: Optional[str] = None
+    dsfa_id: Optional[str] = None
+
+
+class VVTActivityUpdate(BaseModel):
+    name: Optional[str] = None
+    description: Optional[str] = None
+    purposes: Optional[List[str]] = None
+    legal_bases: Optional[List[str]] = None
+    data_subject_categories: Optional[List[str]] = None
+    personal_data_categories: Optional[List[str]] = None
+    recipient_categories: Optional[List[str]] = None
+    third_country_transfers: Optional[List[Any]] = None
+    retention_period: Optional[Dict[str, Any]] = None
+    tom_description: Optional[str] = None
+    business_function: Optional[str] = None
+    systems: Optional[List[str]] = None
+    deployment_model: Optional[str] = None
+    data_sources: Optional[List[Any]] = None
+    data_flows: Optional[List[Any]] = None
+    protection_level: Optional[str] = None
+    dpia_required: Optional[bool] = None
+    structured_toms: Optional[Dict[str, Any]] = None
+    status: Optional[str] = None
+    responsible: Optional[str] = None
+    owner: Optional[str] = None
+    last_reviewed_at: Optional[datetime] = None
+    next_review_at: Optional[datetime] = None
+    created_by: Optional[str] = None
+    dsfa_id: Optional[str] = None
+
+
+class VVTActivityResponse(BaseModel):
+    id: str
+    vvt_id: str
+    name: str
+    description: Optional[str] = None
+    purposes: List[Any] = []
+    legal_bases: List[Any] = []
+    data_subject_categories: List[Any] = []
+    personal_data_categories: List[Any] = []
+    recipient_categories: List[Any] = []
+    third_country_transfers: List[Any] = []
+    retention_period: Dict[str, Any] = {}
+    tom_description: Optional[str] = None
+    business_function: Optional[str] = None
+    systems: List[Any] = []
+    deployment_model: Optional[str] = None
+    data_sources: List[Any] = []
+    data_flows: List[Any] = []
+    protection_level: str = 'MEDIUM'
+    dpia_required: bool = False
+    structured_toms: Dict[str, Any] = {}
+    status: str = 'DRAFT'
+    responsible: Optional[str] = None
+    owner: Optional[str] = None
+    last_reviewed_at: Optional[datetime] = None
+    next_review_at: Optional[datetime] = None
+    created_by: Optional[str] = None
+    dsfa_id: Optional[str] = None
+    created_at: datetime
+    updated_at: Optional[datetime] = None
+
+    model_config = ConfigDict(from_attributes=True)
+
+
+class VVTStatsResponse(BaseModel):
+    total: int
+    by_status: Dict[str, int]
+    by_business_function: Dict[str, int]
+    dpia_required_count: int
+    third_country_count: int
+    draft_count: int
+    approved_count: int
+    overdue_review_count: int = 0
+
+
+class VVTAuditLogEntry(BaseModel):
+    id: str
+    action: str
+    entity_type: str
+    entity_id: Optional[str] = None
+    changed_by: Optional[str] = None
+    old_values: Optional[Dict[str, Any]] = None
+    new_values: Optional[Dict[str, Any]] = None
+    created_at: datetime
+
+    model_config = ConfigDict(from_attributes=True)
+