perf: 内置 applets 自动安装

apps/terminal/management/commands/install_builtin_applets.py

@@ -0,0 +1,9 @@
+from django.core.management.base import BaseCommand
+
+
+class Command(BaseCommand):
+    help = 'Install builtin applets'
+
+    def handle(self, *args, **options):
+        from terminal.applets import install_or_update_builtin_applets
+        install_or_update_builtin_applets()