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/calendar/plugin.py

@@ -3,7 +3,13 @@
 from __future__ import annotations
 
 from app.plugins.base import BasePlugin
-from app.plugins.manifest import PluginManifest, PluginRouteDef, FrontendMenuItem, FrontendPageRoute, FrontendDetailTab
+from app.plugins.manifest import (
+    FrontendDetailTab,
+    FrontendMenuItem,
+    FrontendPageRoute,
+    PluginManifest,
+    PluginRouteDef,
+)
 
 
 class CalendarPlugin(BasePlugin):
@@ -56,11 +62,45 @@ class CalendarPlugin(BasePlugin):
         contract_version="1.0.0",
     )
 
+    async def on_activate(self, db, service_container, event_bus) -> None:
+        """Activate plugin: register restore config + history hooks."""
+        await super().on_activate(db, service_container, event_bus)
+
+        # Register restore config for CalendarEntry entities (P0-7 fix)
+        from app.core.restore_registry import RestoreConfig, get_restore_registry
+        from app.plugins.builtins.calendar.models import CalendarEntry
+        get_restore_registry().register(RestoreConfig(
+            entity_type="calendar_entry",
+            model_class=CalendarEntry,
+            restore_permission="calendar:write",
+            excluded_fields=frozenset({"calendar_id", "created_by", "assigned_to", "source_mail_id"}),
+        ))
+
+        # Register history hooks for CalendarEntry entities (P0-8 fix)
+        from app.core.history_hooks import register_history_hooks
+        from app.core.hooks import get_hook_registry
+        register_history_hooks(
+            get_hook_registry(), "calendar_entry",
+            "calendar_entry.after_create", "calendar_entry.after_update", "calendar_entry.after_delete",
+            owner_tag="calendar",
+        )
+
     async def on_deactivate(
         self, db, service_container, event_bus
     ) -> None:
-        """Deactivate plugin: unregister contract and event listeners."""
+        """Deactivate plugin: unregister contract, restore, history, events."""
         # Contract abmelden
         from app.plugins.builtins.contracts import get_contract_registry
         get_contract_registry().unregister(self.manifest.name)
+
+        # Unregister restore config (P0-7 fix)
+        from app.core.restore_registry import get_restore_registry
+        get_restore_registry().unregister("calendar_entry")
+
+        # Unregister history hooks (free functions, not bound methods)
+        from app.core.hooks import get_hook_registry
+        get_hook_registry().unregister_actions_by_owner("calendar_entry.after_create", "calendar")
+        get_hook_registry().unregister_actions_by_owner("calendar_entry.after_update", "calendar")
+        get_hook_registry().unregister_actions_by_owner("calendar_entry.after_delete", "calendar")
+
         await super().on_deactivate(db, service_container, event_bus)