feat: enhance agent management and validation logic

- Updated AGENTS.md to clarify agent account restrictions and permissions.
- Implemented checks in AgentNodeAdminUserStoreController and AgentNodeRoleStoreController to restrict admin user and role creation to the agent's own node.
- Enhanced validation in AdminPlayerStoreController and AdminPlayerUpdateController to enforce credit limit and rebate rate rules based on player funding mode.
- Refactored various request classes to utilize shared admin account field rules for consistency.
- Improved error handling in services related to credit allocation and rebate limits to ensure proper validation and messaging.

app/Support/AdminDataScope.php

@@ -43,6 +43,17 @@ final class AdminDataScope
             $query->whereIn($alias.'.site_code', $codes);
         }
 
+        // Check if admin is a platform account (bound via admin_user_site_roles)
+        $accessibleSiteIds = $admin->accessibleAdminSiteIds();
+        if ($accessibleSiteIds !== null) {
+            // Platform account (site admin) - no agent node filtering needed
+            if ($requestedAgentNodeId !== null && $requestedAgentNodeId > 0) {
+                self::applyAgentNodeIdOnAlias($query, $admin, $alias, $requestedAgentNodeId);
+            }
+            return;
+        }
+
+        // Agent account (bound via agent node)
         $actor = AdminAgentScope::primaryAgentNode($admin);
         if ($actor === null) {
             $query->whereRaw('0 = 1');