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/marketplace/services.py

@@ -3,7 +3,6 @@
 from __future__ import annotations
 
 import logging
-import os
 import shutil
 import tempfile
 import zipfile
@@ -11,13 +10,12 @@ from pathlib import Path
 from typing import Any
 
 import httpx
-from sqlalchemy import and_, func, select
+from sqlalchemy import func, select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.plugins.builtins.marketplace.config import (
     MARKETPLACE_DOWNLOAD_TIMEOUT,
     MARKETPLACE_MAX_ZIP_SIZE,
-    MARKETPLACE_SERVER_URL,
 )
 from app.plugins.builtins.marketplace.models import MarketplaceListing
 from app.plugins.signature import PluginSignature
@@ -70,7 +68,7 @@ async def fetch_listings(
     listings = (await db.execute(query)).scalars().all()
 
     return {
-        "listings": [_listing_to_response(l) for l in listings],
+        "listings": [_listing_to_response(listing) for listing in listings],
         "total": total,
         "page": page,
         "page_size": page_size,
@@ -121,7 +119,7 @@ async def download_plugin(
         # Validate it's a valid ZIP
         if not zipfile.is_zipfile(zip_path):
             shutil.rmtree(temp_dir, ignore_errors=True)
-            raise ValueError(f"Downloaded file is not a valid ZIP archive")
+            raise ValueError("Downloaded file is not a valid ZIP archive")
 
         return zip_path
 
@@ -189,7 +187,6 @@ async def install_plugin(
     try:
         # 3. Verify signature if public key is available
         if listing.signature_public_key:
-            public_key_bytes = listing.signature_public_key.encode("utf-8")
             # We need the signature from the listing — for now, we verify
             # that the ZIP hash matches the allowlist (basic integrity check)
             file_hash = PluginSignature.compute_hash(zip_path)
@@ -204,7 +201,7 @@ async def install_plugin(
 
         # Copy the ZIP to a temp location for the plugin service
         # The plugin service expects a ZIP file to extract
-        install_result = await service.install_plugin_from_zip(
+        await service.install_plugin_from_zip(
             db,
             zip_path=str(zip_path),
             tenant_id=tenant_id,