fix(audit): P0-P3 audit fixes — 838 ruff errors → 0, 30 F821 bugs fixed, 118 files changed

- P0: hooks.py 3-tuple fix, trigger_dispatcher Contract, contacts/plugin unregister_actions_by_owner
- P0: 5 test files — check_permission mocks removed, hardcoded DB credential → env var
- P1: attachment_service DmsFile via Contract helper, restore_registry/history_hooks dedup
- P1: mail/plugin restore unregister, mcp_client datetime.now(UTC), saved_views/filters patterns
- P1: ProtectedRoute fail-closed, 13 test assertion fixes (bcrypt, DB-URLs, SECRET_KEYs)
- P2: deprecated notifications → post_system_message (3 files), forgejo Base, report_generator lazy import
- P2: webhooks permissions, deps.py/roles.py plugin perms removed, import_export default
- P2: address/tags/entity_links patterns removed, worker.py Contract-Umgehungen fixed
- P2: 28 frontend TODOs (hardcoded constants, deprecated notification API)
- P3: dead code, duplicates, deprecated imports, private attr, __import__ inline
- P3: 8 frontend TODOs (LucideIcons, inline styles, XSS, i18n)
- ruff: 838 → 0 (612 auto-fix + 246 manual + 27 F821 regression fix)
- F821: 30 → 0 (AutomationDefinition, DmsFile, user_id, Path, Any, String)
- Contract-Umgehungen: 2 neue gefunden (worker.py:169, worker.py:280) und gefixt

app/routes/companies.py

@@ -12,12 +12,12 @@ from datetime import UTC, datetime
 from typing import Any
 
 from fastapi import APIRouter, Depends, HTTPException, Query, Response, status
-from sqlalchemy import select, func
-from sqlalchemy.orm import selectinload
+from sqlalchemy import func, select
 from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy.orm import selectinload
 
 from app.core.db import get_db
-from app.deps import get_current_user, get_redis_dep, require_permission
+from app.deps import get_redis_dep, require_permission
 from app.models.audit import AuditLog
 from app.models.contact import Contact
 from app.services.entity_history_service import record_history
@@ -44,8 +44,8 @@ def _serialize_company(c: Contact) -> dict[str, Any]:
         "mailing_country": c.mailing_country,
         "tags": c.tags,
         "custom": c.custom,
-        
-        
+
+
     }
 
 
@@ -152,7 +152,7 @@ async def export_companies(
         try:
             import openpyxl
         except ImportError:
-            raise HTTPException(status_code=500, detail="openpyxl not installed")
+            raise HTTPException(status_code=500, detail="openpyxl not installed") from None
         wb = openpyxl.Workbook()
         ws = wb.active
         ws.title = "Companies"
@@ -332,6 +332,7 @@ async def unlink_contact_from_company(
         raise HTTPException(status_code=404, detail="Company not found")
     # Remove ContactPerson link
     from sqlalchemy import delete as sa_delete
+
     from app.models.contact import ContactPerson
     await db.execute(
         sa_delete(ContactPerson).where(