Move plugins to manifest, pin Docker version, add Makefile

- Add plugins.txt listing all plugins for reproducible installs
- Add Makefile with setup/start/stop/install-plugins targets
- Remove user/plugins/ from git tracking
- Pin Docker image to 1.7.49.5-ls244

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plugins/admin/permissions.yaml

@@ -1,48 +0,0 @@
-actions:
-  site:
-    label: PLUGIN_ADMIN.ACCESS_SITE
-    actions:
-      login:
-        label: PLUGIN_ADMIN.ACCESS_SITE_LOGIN
-
-  admin:
-    label: PLUGIN_ADMIN.ACCESS_ADMIN
-    actions:
-      login:
-        label: PLUGIN_ADMIN.ACCESS_ADMIN_LOGIN
-      super:
-        label: PLUGIN_ADMIN.ACCESS_ADMIN_SUPER
-      cache:
-        label: PLUGIN_ADMIN.ACCESS_ADMIN_CACHE
-
-      configuration:
-        label: PLUGIN_ADMIN.ACCESS_ADMIN_CONFIGURATION
-        actions:
-          system:
-            label: PLUGIN_ADMIN.ACCESS_ADMIN_CONFIGURATION_SYSTEM
-          site:
-            label: PLUGIN_ADMIN.ACCESS_ADMIN_CONFIGURATION_SITE
-          media:
-            label: PLUGIN_ADMIN.ACCESS_ADMIN_CONFIGURATION_MEDIA
-          security:
-            label: PLUGIN_ADMIN.ACCESS_ADMIN_CONFIGURATION_SECURITY
-          info:
-            label: PLUGIN_ADMIN.ACCESS_ADMIN_CONFIGURATION_INFO
-      pages:
-        label: PLUGIN_ADMIN.ACCESS_ADMIN_PAGES
-      maintenance:
-        label: PLUGIN_ADMIN.ACCESS_ADMIN_MAINTENANCE
-      statistics:
-        label: PLUGIN_ADMIN.ACCESS_ADMIN_STATISTICS
-      plugins:
-        label: PLUGIN_ADMIN.ACCESS_ADMIN_PLUGINS
-      themes:
-        label: PLUGIN_ADMIN.ACCESS_ADMIN_THEMES
-      tools:
-        label: PLUGIN_ADMIN.ACCESS_ADMIN_TOOLS
-      users:
-        label: PLUGIN_ADMIN.ACCESS_ADMIN_USERS
-
-types:
-  default:
-    type: access