docs: 合并重复的管理后台章节，保留集成说明中的完整列表

README.en.md

@@ -14,7 +14,6 @@ Sub2ApiPay is a self-hosted payment gateway built for the [Sub2API](https://sub2
 - [Environment Variables](#environment-variables)
 - [Deployment](#deployment)
 - [Sub2API Integration](#sub2api-integration)
-- [Admin Panel](#admin-panel)
 - [Payment Flow](#payment-flow)
 - [API Endpoints](#api-endpoints)
 - [Development](#development)
@@ -330,20 +329,6 @@ The admin panel is authenticated via the `token` URL parameter (set to the `ADMI
 
 ---
 
-## Admin Panel
-
-Access: `https://pay.example.com/admin?token=YOUR_ADMIN_TOKEN`
-
-| Module        | Path                   | Description                                                   |
-| ------------- | ---------------------- | ------------------------------------------------------------- |
-| Overview      | `/admin`               | Aggregated entry with card-style navigation                   |
-| Orders        | `/admin/orders`        | Filter by status, paginate, view details, retry/cancel/refund |
-| Dashboard     | `/admin/dashboard`     | Revenue stats, order trends, payment method breakdown         |
-| Channels      | `/admin/channels`      | Configure API channels & rates, sync from Sub2API             |
-| Subscriptions | `/admin/subscriptions` | Manage subscription plans & user subscriptions                |
-
----
-
 ## Payment Flow
 
 ```

README.md

@@ -14,7 +14,6 @@ Sub2ApiPay 是为 [Sub2API](https://sub2api.com) 平台构建的自托管支付
 - [环境变量](#环境变量)
 - [部署指南](#部署指南)
 - [集成到 Sub2API](#集成到-sub2api)
-- [管理后台](#管理后台)
 - [支付流程](#支付流程)
 - [API 端点](#api-端点)
 - [开发指南](#开发指南)
@@ -330,20 +329,6 @@ Sub2API **v0.1.88** 及以上版本会自动拼接以下参数，无需手动添
 
 ---
 
-## 管理后台
-
-访问：`https://pay.example.com/admin?token=YOUR_ADMIN_TOKEN`
-
-| 模块     | 路径                   | 说明                                           |
-| -------- | ---------------------- | ---------------------------------------------- |
-| 总览     | `/admin`               | 聚合入口，卡片式导航到各管理模块               |
-| 订单管理 | `/admin/orders`        | 按状态筛选、分页浏览、订单详情、重试/取消/退款 |
-| 数据概览 | `/admin/dashboard`     | 收入统计、订单趋势、支付方式分布               |
-| 渠道管理 | `/admin/channels`      | 配置 API 渠道与倍率，支持从 Sub2API 同步       |
-| 订阅管理 | `/admin/subscriptions` | 管理订阅套餐与用户订阅                         |
-
----
-
 ## 支付流程
 
 ```