Move Custom Scripts out of the repo and add an Import Script picker

Custom Scripts (the Scheduler page's inline editor) used to save into the
git-tracked Custom/ folder, so anything saved there would end up on GitHub.
They now live in /boot/config/plugins/user.scripts/Varaverk/Scripts, same
folder family as Unraid's own User Scripts plugin. Import Script lets you
browse the whole server and move an existing script in instead of only
creating new ones inline — always a move, never a copy, so no stray
duplicate is left where it came from.

Plugin/unraid/include/config.php

@@ -11,6 +11,11 @@ define('DEPLOY_DIR',  SCRIPTS_DIR . '/Deployment');
 define('DATA_DIR',    SCRIPTS_DIR . '/data');
 define('STATE_DIR',   SCRIPTS_DIR . '/State_Files');
 define('LOG_DIR',     '/var/log/varaverk');
+// User-authored custom scripts (scheduler page "+ Create Script") — kept outside the git
+// repo entirely, alongside the User Scripts plugin's own storage. Any *.sh file placed
+// directly in this folder is auto-detected and listed — it doesn't have to be created
+// through the page's editor.
+define('CUSTOM_SCRIPTS_DIR', $_vv_cfg['CUSTOM_SCRIPTS_DIR'] ?? '/boot/config/plugins/user.scripts/Varaverk/Scripts');
 unset($_vv_cfg);
 
 define('VV_SETUP_STATE_FILE', STATE_DIR . '/varaverk_setup.db');