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

app/Http/Requests/Admin/Concerns/AgentProfileFieldRules.php

@@ -13,8 +13,8 @@ trait AgentProfileFieldRules
             'total_share_rate' => ['sometimes', 'numeric', 'min:0', 'max:100'],
             'relative_share_rate' => ['sometimes', 'numeric', 'min:0', 'max:100'],
             'credit_limit' => ['sometimes', 'integer', 'min:0'],
-            'rebate_limit' => ['sometimes', 'numeric', 'min:0', 'max:1'],
-            'default_player_rebate' => ['sometimes', 'numeric', 'min:0', 'max:1'],
+            'rebate_limit' => ['sometimes', 'numeric', 'min:0', 'max:100'],
+            'default_player_rebate' => ['sometimes', 'numeric', 'min:0', 'max:100'],
             'settlement_cycle' => ['sometimes', 'string', 'in:'.implode(',', AgentSettlementCycle::VALUES)],
             'can_grant_extra_rebate' => ['sometimes', 'boolean'],
             'can_create_child_agent' => ['sometimes', 'boolean'],