doc changes and reference folder

docs/modules/SERVER_CONTENT_MANAGER.md

@@ -61,6 +61,29 @@ Current default install paths:
 - Generic Steam Workshop content: `{SERVER_ROOT}/workshop/{MOD_FOLDER}`
 - DayZ / Arma strategy content: `{SERVER_ROOT}/{MOD_FOLDER}` for root `@<workshop_id>` folder compatibility
 
+Game XML fallback should use the canonical `workshop_support` block:
+
+```xml
+<workshop_support>
+  <enabled>1</enabled>
+  <provider>steam</provider>
+  <steam_app_id>107410</steam_app_id>
+  <workshop_app_id>107410</workshop_app_id>
+  <download_method>steamcmd</download_method>
+  <install_strategy>arma_mod_folder</install_strategy>
+  <install_path>{SERVER_ROOT}/{MOD_FOLDER}</install_path>
+  <startup_param_format>-mod={MOD_LIST}</startup_param_format>
+  <mod_separator>;</mod_separator>
+  <mod_prefix>@</mod_prefix>
+  <copy_keys enabled="1">
+    <source_pattern>{MOD_PATH}/keys/*.bikey</source_pattern>
+    <target_path>{SERVER_ROOT}/keys</target_path>
+  </copy_keys>
+</workshop_support>
+```
+
+The Panel helper parser reads this block first and only tolerates old direct tags as an internal compatibility fallback.
+
 SteamCMD requirements:
 
 - Linux agents need SteamCMD available at the configured profile/template path, `STEAMCMD_PATH`, `/home/gameserver/steamcmd/steamcmd.sh`, or in `PATH`.
@@ -99,3 +122,14 @@ This module is the right place for:
 - install history
 
 The old `steam_workshop` module should be treated as a deprecated compatibility layer, not the main future path.
+
+## Validation
+
+Relevant smoke tests:
+
+```bash
+php Panel/modules/addonsmanager/tests/workshop_helpers_test.php
+php Panel/modules/config_games/tests/validate_server_configs.php
+```
+
+`validate_server_configs.php` validates every XML file under `Panel/modules/config_games/server_configs/` against `schema_server_config.xml`.