fix(e7): CI-Gate-Vorbereitung — ruff über app/ von 105 auf 0 Findings bereinigt; 8 echte F821-NameError-Produktionsbugs behoben (external_api stream_chat-Call-Signatur an stream_chat_comm angepasst, agent_runner uuid vor lokalem Import, automation/plugin UserTenant-Import, tasks delete-audit user_id, workflows/engine timedelta, unified_search/contracts Any); py311-kompatibles StepHandler-Alias statt type-Statement; E402/F841 bereinigt; Verifikation 85/89 grün (4 Failures = bekannter Vorbestand BUG-099)

app/models/__init__.py

@@ -6,8 +6,8 @@ from app.models.audit import AuditLog
 from app.models.auth import ApiToken, PasswordResetToken
 from app.models.backup import Backup
 from app.models.bank_account import BankAccount
-from app.models.consumer_inbox import ConsumerInbox
 from app.models.compliance import ComplianceIncident
+from app.models.consumer_inbox import ConsumerInbox
 from app.models.contact import Contact, ContactPerson
 from app.models.contact_folder import ContactFolder
 from app.models.contact_merge import ContactMergeHistory

app/models/audit.py

@@ -11,13 +11,12 @@ from datetime import datetime
 from typing import Any
 
 from sqlalchemy import DateTime, ForeignKey, String, func
-from sqlalchemy.dialects.postgresql import JSONB
+from sqlalchemy.dialects.postgresql import JSONB, TSVECTOR
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.core.db import Base, TenantMixin
 from app.models.owned_mixin import OwnedMixin
-from sqlalchemy.dialects.postgresql import TSVECTOR
 
 # Re-export EntityHistory as DeletionLog for backward compatibility.
 # Tests import DeletionLog from app.models.audit and use entity_snapshot attribute.

app/models/user.py

@@ -12,7 +12,6 @@ from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.core.db import Base, SoftDeleteMixin, TimestampMixin
-from app.models.owned_mixin import OwnedMixin
 
 
 class User(Base, TimestampMixin, SoftDeleteMixin):