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/ws_helpers.py

@@ -6,14 +6,15 @@ import asyncio
 import json
 import logging
 import uuid
-from typing import Any, Callable
+from collections.abc import Callable
+from typing import Any
 
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 from starlette.websockets import WebSocket
 
-from app.core.auth import get_redis, get_session_data, verify_ws_origin
 from app.config import get_settings
+from app.core.auth import get_redis, get_session_data, verify_ws_origin
 
 logger = logging.getLogger(__name__)
 
@@ -167,7 +168,7 @@ async def drain_all_connections(grace_period_seconds: float = 5.0) -> None:
     """
     total_connections = 0
     for registry in _global_ws_registries:
-        for user_id, conns in list(registry.items()):
+        for _user_id, conns in list(registry.items()):
             for ws in list(conns):
                 try:
                     await ws.send_text(json.dumps({
@@ -186,7 +187,7 @@ async def drain_all_connections(grace_period_seconds: float = 5.0) -> None:
 
     # Close all connections
     for registry in _global_ws_registries:
-        for user_id, conns in list(registry.items()):
+        for _user_id, conns in list(registry.items()):
             for ws in list(conns):
                 try:
                     await ws.close(code=1001, reason="Server shutting down")