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/guests.py

@@ -12,18 +12,16 @@ from __future__ import annotations
 import hashlib
 import secrets
 import uuid
-from datetime import UTC, datetime, timedelta
 
 from fastapi import APIRouter, Depends, HTTPException, Request, status
-from sqlalchemy import select, update
+from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.config import get_settings
 from app.core.auth import get_redis, hash_password
 from app.core.db import get_db
-from app.deps import get_current_user, require_admin
+from app.deps import require_admin
 from app.models.user import User, UserTenant
-from app.models.tenant import Tenant
 
 router = APIRouter(prefix="/api/v1/guests", tags=["guests"])
 settings = get_settings()
@@ -47,8 +45,6 @@ async def invite_guest(
     """
     email = body.get("email", "")
     name = body.get("name", "")
-    expires_in_hours = body.get("expires_in_hours", 72)
-
     if not email or not name:
         raise HTTPException(
             status_code=status.HTTP_400_BAD_REQUEST,
@@ -56,7 +52,6 @@ async def invite_guest(
         )
 
     tenant_id = uuid.UUID(current_user["tenant_id"])
-    user_id = uuid.UUID(current_user["user_id"])
 
     # Check if user already exists by email
     user_q = await db.execute(
@@ -172,7 +167,7 @@ async def delete_guest(
         raise HTTPException(
             status_code=status.HTTP_400_BAD_REQUEST,
             detail={"detail": "Invalid guest ID", "code": "invalid_id"},
-        )
+        ) from None
 
     # Find the user_tenants entry for this guest
     ut_q = await db.execute(