refactor: 调整返点字段为百分比格式并新增集成指南路由

- 将 rebate_limit 和 default_player_rebate 的校验范围从 0-1 改为 0-100
- 在服务层进行百分比与小数的转换（输入除以100，输出乘以100）
- 更新相关测试用例以匹配新的百分比格式
- 新增 admin/docs/integration-guide 路由用于集成文档展示

tests/Feature/AdminAgentProfileApiTest.php

@@ -42,8 +42,8 @@ test('super admin can update agent profile with capability flags', function ():
         ->putJson('/api/v1/admin/agent-nodes/'.$child->id.'/profile', [
             'total_share_rate' => 12,
             'credit_limit' => 1200,
-            'rebate_limit' => 0.01,
-            'default_player_rebate' => 0.005,
+            'rebate_limit' => 1,
+            'default_player_rebate' => 0.5,
             'settlement_cycle' => 'weekly',
             'can_grant_extra_rebate' => false,
             'can_create_child_agent' => true,
@@ -224,8 +224,8 @@ test('agent profile update rejects default rebate above limit', function (): voi
 
     $this->withHeader('Authorization', 'Bearer '.$token)
         ->putJson('/api/v1/admin/agent-nodes/'.$child->id.'/profile', [
-            'rebate_limit' => 0.005,
-            'default_player_rebate' => 0.01,
+            'rebate_limit' => 0.5,
+            'default_player_rebate' => 1,
         ])
         ->assertStatus(422)
         ->assertJsonPath('code', ErrorCode::ValidationFailed->value);