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.

tests/Pest.php

@@ -88,6 +88,27 @@ function bindAdminUserToAgent(AdminUser $admin, int $agentNodeId): void
     );
 }
 
+/** 确保默认站点一级代理已有占成/授信档案（子代理创建与额度校验依赖）。 */
+function ensureRootAgentProfileSeeded(): void
+{
+    $rootId = DB::table('agent_nodes')->where('depth', 0)->value('id');
+    if ($rootId === null) {
+        return;
+    }
+
+    \App\Models\AgentProfile::query()->updateOrCreate(
+        ['agent_node_id' => (int) $rootId],
+        [
+            'total_share_rate' => 100,
+            'credit_limit' => 1_000_000,
+            'allocated_credit' => 0,
+            'used_credit' => 0,
+            'rebate_limit' => 1,
+            'default_player_rebate' => 0,
+        ],
+    );
+}
+
 function ensureAdminActionCatalogSeeded(): void
 {
     if (! Schema::hasTable('admin_action_catalog')) {