redo of steam workshop

docs/features/SCHEDULER_SYSTEM.md

@@ -33,3 +33,35 @@ Important references:
 - clear logs and results
 - no customer raw shell commands by default
 
+## Server Content / Workshop Actions
+
+The Scheduler must use Server Content Manager actions for Workshop automation. Do not build a separate Workshop scheduler.
+
+Current Server Content actions:
+
+| Action Key | Purpose |
+|---|---|
+| `server_content_check_updates` | Check content update state. |
+| `server_content_check_workshop_updates` | Check Workshop update state. |
+| `server_content_install_updates_if_stopped` | Install only when the server is stopped. |
+| `server_content_install_updates_next_restart` | Queue updates for the next restart. |
+| `server_content_install_updates_now` | Install available updates immediately. |
+| `server_content_install_updates_and_restart` | Install updates, wait, then restart. |
+| `server_content_update_all` | Update all server content records. |
+| `server_content_validate_files` | Validate server content files. |
+| `server_content_backup_before_update` | Backup before applying updates. |
+
+Workshop-specific aliases:
+
+| Action Key | Purpose |
+|---|---|
+| `workshop_update` | Update installed Workshop items through Server Content Manager. |
+| `workshop_update_and_restart` | Update Workshop items and request a safe restart. |
+| `workshop_download_only` | Download/cache Workshop items without installing into live folders. |
+| `workshop_install_pending_on_restart` | Install items marked as pending during the restart/maintenance window. |
+
+Implementation references:
+
+- `Panel/modules/cron/shared_cron_functions.php`
+- `Panel/modules/addonsmanager/server_content_actions.php`
+- `Panel/modules/addonsmanager/workshop_action.php`