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/trigger_dispatcher.py

@@ -113,7 +113,12 @@ class TriggerDispatcher:
     ) -> None:
         """Query DB for active automations matching *event_name* and dispatch."""
         from app.core.db import get_session_factory
-        from app.plugins.builtins.automation.models import AutomationDefinition
+        from app.plugins.builtins.contracts import get_contract
+        automation_contract = get_contract("automation")
+        AutomationDefinition = automation_contract.Automation  # noqa: N806
+        if automation_contract is None:
+            logger.debug("Automation plugin not available — trigger skipped")
+            return
 
         factory = get_session_factory()
         tenant_id = payload.get("tenant_id")
@@ -171,15 +176,16 @@ class TriggerDispatcher:
         For production workloads with back-pressure, the caller may
         alternatively enqueue via ``enqueue_job``.
         """
-        from app.plugins.builtins.automation.execution_engine import run_automation
-
         try:
-            await run_automation(
-                ctx={},
-                automation_id=automation_id,
-                trigger_type=trigger_type,
-                trigger_data=trigger_data,
-            )
+            from app.plugins.builtins.contracts import get_contract
+            automation_contract = get_contract("automation")
+            if automation_contract is not None:
+                await automation_contract.run_automation(
+                    ctx={},
+                    automation_id=automation_id,
+                    trigger_type=trigger_type,
+                    trigger_data=trigger_data,
+                )
         except Exception:
             logger.exception(
                 "TriggerDispatcher: run_automation failed for automation_id=%s",