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/plugins/builtins/ai_proactive/routes.py

@@ -15,8 +15,7 @@ from fastapi import APIRouter, Depends, HTTPException, Query
 from fastapi.responses import StreamingResponse
 from sqlalchemy.ext.asyncio import AsyncSession
 
-from app.core.db import get_db, set_tenant_context
-from app.core.visibility import apply_visibility_filter
+from app.core.db import get_db
 from app.core.event_bus import get_event_bus
 from app.deps import get_current_user, require_permission
 from app.plugins.builtins.ai_proactive.models import (
@@ -30,9 +29,9 @@ from app.plugins.builtins.ai_proactive.schemas import (
     ContextReport,
     SettingsResponse,
     SettingsUpdate,
+    StatsResponse,
     SuggestionListResponse,
     SuggestionResponse,
-    StatsResponse,
 )
 from app.plugins.builtins.ai_proactive.services import (
     execute_suggested_action,
@@ -184,7 +183,7 @@ async def dismiss_suggestion(
     try:
         sid = uuid.UUID(suggestion_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid suggestion ID")
+        raise HTTPException(status_code=400, detail="Invalid suggestion ID") from None
 
     success = await mark_dismissed(db, sid, user_id, tenant_id)
     if not success:
@@ -210,7 +209,7 @@ async def act_on_suggestion(
     try:
         sid = uuid.UUID(suggestion_id)
     except (ValueError, TypeError):
-        raise HTTPException(status_code=400, detail="Invalid suggestion ID")
+        raise HTTPException(status_code=400, detail="Invalid suggestion ID") from None
 
     result = await execute_suggested_action(
         db, sid, action.action_index, user_id, tenant_id, current_user
@@ -245,7 +244,7 @@ async def stream_suggestions(
             try:
                 suggestion = await asyncio.wait_for(queue.get(), timeout=30)
                 yield f"data: {json.dumps(suggestion, default=str)}\n\n"
-            except asyncio.TimeoutError:
+            except TimeoutError:
                 yield ": keepalive\n\n"
 
     return StreamingResponse(