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/mcp_client/routes.py

@@ -7,13 +7,13 @@ import uuid
 from datetime import datetime
 from typing import Any
 
-from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi import APIRouter, Depends, HTTPException
 from sqlalchemy import select, update
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.db import get_db
 from app.core.visibility import apply_visibility_filter
-from app.deps import get_current_user, require_permission
+from app.deps import require_permission
 from app.plugins.builtins.mcp_client.client import McpClient
 from app.plugins.builtins.mcp_client.models import McpServerConfig as McpServerConfigModel
 from app.plugins.builtins.mcp_client.schemas import (
@@ -97,7 +97,7 @@ async def update_mcp_server(
     try:
         sid = uuid.UUID(server_id)
     except (ValueError, TypeError):
-        raise HTTPException(400, detail={"detail": "Invalid server_id", "code": "invalid_id"})
+        raise HTTPException(400, detail={"detail": "Invalid server_id", "code": "invalid_id"}) from None
 
     stmt = select(McpServerConfigModel).where(
         McpServerConfigModel.id == sid,
@@ -127,7 +127,7 @@ async def delete_mcp_server(
     try:
         sid = uuid.UUID(server_id)
     except (ValueError, TypeError):
-        raise HTTPException(400, detail={"detail": "Invalid server_id", "code": "invalid_id"})
+        raise HTTPException(400, detail={"detail": "Invalid server_id", "code": "invalid_id"}) from None
 
     stmt = select(McpServerConfigModel).where(
         McpServerConfigModel.id == sid,
@@ -152,7 +152,7 @@ async def list_server_tools(
     try:
         sid = uuid.UUID(server_id)
     except (ValueError, TypeError):
-        raise HTTPException(400, detail={"detail": "Invalid server_id", "code": "invalid_id"})
+        raise HTTPException(400, detail={"detail": "Invalid server_id", "code": "invalid_id"}) from None
 
     stmt = select(McpServerConfigModel).where(
         McpServerConfigModel.id == sid,
@@ -176,7 +176,7 @@ async def list_server_tools(
         return tools_resp
     except Exception as exc:
         logger.exception("Failed to list tools from MCP server %s", cfg.name)
-        raise HTTPException(502, detail={"detail": f"Failed to connect: {exc}", "code": "connection_failed"})
+        raise HTTPException(502, detail={"detail": f"Failed to connect: {exc}", "code": "connection_failed"}) from exc
 
 
 @router.post("/servers/{server_id}/execute", response_model=McpServerExecuteResponse)
@@ -190,7 +190,7 @@ async def execute_server_tool(
     try:
         sid = uuid.UUID(server_id)
     except (ValueError, TypeError):
-        raise HTTPException(400, detail={"detail": "Invalid server_id", "code": "invalid_id"})
+        raise HTTPException(400, detail={"detail": "Invalid server_id", "code": "invalid_id"}) from None
 
     stmt = select(McpServerConfigModel).where(
         McpServerConfigModel.id == sid,