fix: remove mail settings, automation/agents from sidebar + settings from bottom

- Remove Einstellungen from E-Mail group (accessible via Settings page)
- Remove Automation and Agenten from sidebar (accessible via Topbar profile menu)
- Remove Settings from sidebar bottom items

app/plugins/builtins/automation/plugin.py

@@ -69,24 +69,7 @@ class AutomationPlugin(BasePlugin):
             "agents:execute",
         ],
         is_core=False,
-        menu_items=[
-            FrontendMenuItem(
-                label_key="nav.automation",
-                label="Automation",
-                path="/automation",
-                icon="Zap",
-                group="Automation",
-                order=50,
-            ),
-            FrontendMenuItem(
-                label_key="nav.agents",
-                label="Agenten",
-                path="/agents",
-                icon="Bot",
-                group="Automation",
-                order=51,
-            ),
-        ],
+        menu_items=[],
         page_routes=[
             FrontendPageRoute(
                 path="/automation",

app/plugins/builtins/mail/plugin.py

@@ -57,8 +57,7 @@ class MailPlugin(BasePlugin):
         migrations=["0001_initial.sql", "0006_flag_type.sql", "0007_sync_queue.sql", "0008_sync_queue_deleted_at.sql", "0009_remove_mail_soft_delete.sql", "0010_add_deleted_at.sql"],
         permissions=["mail:read", "mail:send", "mail:config", "mail:share", "mail:write", "mail:delete"],
         menu_items=[
-            FrontendMenuItem(label_key='nav.mail', label='E-Mail', path='/mail', icon='Mail', group='E-Mail', order=30),
-            FrontendMenuItem(label_key='nav.mail.settings', label='Einstellungen', path='/mail/settings', icon='Settings', group='E-Mail', order=31),
+            FrontendMenuItem(label_key='nav.mail', label='E-Mail', path='/mail', icon='Mail', order=30),
         ],
         page_routes=[
             FrontendPageRoute(path='/mail', component='@/pages/Mail', protected=True),

frontend/src/components/layout/Sidebar.tsx

@@ -32,9 +32,7 @@ const singleItems: NavSingleItem[] = [
   { to: '/contacts', labelKey: 'nav.contacts', icon: <Users className="w-5 h-5 flex-shrink-0" aria-hidden="true" strokeWidth={2} />, order: 10 },
 ];
 
-const bottomItems: NavSingleItem[] = [
-  { to: '/settings', labelKey: 'nav.settings', icon: <Settings className="w-5 h-5 flex-shrink-0" aria-hidden="true" strokeWidth={2} />, order: 999 },
-];
+const bottomItems: NavSingleItem[] = [];
 
 export function Sidebar() {
   const { t } = useTranslation();