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/Http/Requests/Admin/AgentNodeUpdateRequest.php

@@ -2,23 +2,31 @@
 
 namespace App\Http\Requests\Admin;
 
+use App\Http\Requests\Admin\Concerns\AdminAccountFieldRules;
 use App\Http\Requests\ApiFormRequest;
 
 final class AgentNodeUpdateRequest extends ApiFormRequest
 {
+    use AdminAccountFieldRules;
+
     public function authorize(): bool
     {
         return true;
     }
 
+    protected function prepareForValidation(): void
+    {
+        $this->normalizeAdminAccountFields();
+    }
+
     /** @return array<string, mixed> */
     public function rules(): array
     {
         return [
             'name' => ['sometimes', 'string', 'max:128'],
-            'username' => ['sometimes', 'string', 'max:64'],
+            'username' => $this->adminOperatorUsernameRules(required: false),
             'email' => ['sometimes', 'nullable', 'email', 'max:255'],
-            'password' => ['sometimes', 'nullable', 'string', 'min:8', 'max:128'],
+            'password' => $this->adminLoginPasswordRules(required: false),
             'status' => ['sometimes', 'integer', 'in:0,1'],
         ];
     }