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/core/auth.py

@@ -3,13 +3,12 @@
 from __future__ import annotations
 
 import hashlib
+import logging
 import secrets
 import uuid
 from datetime import UTC, datetime, timedelta
 from typing import Any
 
-import logging
-
 import redis.asyncio as aioredis
 from passlib.context import CryptContext
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -211,10 +210,12 @@ async def get_session_data(redis: aioredis.Redis, session_id: str) -> dict[str,
 
     # DB fallback: query sessions table
     try:
+        from datetime import UTC, datetime
+
+        from sqlalchemy import select
+
         from app.core.db import get_auth_session_factory
         from app.models.session import Session as SessionModel
-        from sqlalchemy import select
-        from datetime import UTC, datetime
 
         factory = get_auth_session_factory()
         async with factory() as db:
@@ -254,9 +255,10 @@ async def invalidate_session(redis: aioredis.Redis, session_id: str) -> None:
     await redis.delete(f"session:{session_id}")
     # Also invalidate in PostgreSQL fallback
     try:
+        from sqlalchemy import delete
+
         from app.core.db import get_session_factory
         from app.models.session import SessionModel
-        from sqlalchemy import delete
         factory = get_session_factory()
         async with factory() as db:
             await db.execute(