feat: C端订单支付拆分 — 创建订单与发起支付分离

- CreateOrder 改造：普通下单只建单（无支付参数），强充场景保持原有微信支付一步完成
- 新增 POST /orders/:id/pay 统一支付入口，支持 wallet（钱包）和 wechat（微信 JSAPI）
- 移除 POST /orders/:id/wallet-pay，合并至统一支付接口
- app_type 改为可选字段（强充场景必传，普通下单无需传）
- CreateOrderResponse.pay_config 改为 omitempty（普通下单不返回支付参数）

docs/admin-openapi.yaml

@@ -1597,7 +1597,7 @@ components:
         DtoClientCreateOrderRequest:
             properties:
                 app_type:
-                    description: 应用类型 (official_account:公众号, miniapp:小程序)
+                    description: 应用类型（强充必传）(official_account:公众号, miniapp:小程序)
                     type: string
                 identifier:
                     description: 资产标识符（SN/IMEI/虚拟号/ICCID/MSISDN）
@@ -1614,7 +1614,6 @@ components:
             required:
                 - identifier
                 - package_ids
-                - app_type
             type: object
         DtoClientCreateOrderResponse:
             properties:
@@ -1849,6 +1848,25 @@ components:
                     description: 时间戳
                     type: string
             type: object
+        DtoClientPayOrderParams:
+            properties:
+                app_type:
+                    description: 应用类型（微信支付必传）(official_account:公众号, miniapp:小程序)
+                    type: string
+                payment_method:
+                    description: 支付方式 (wallet:钱包, wechat:微信)
+                    type: string
+            required:
+                - payment_method
+            type: object
+        DtoClientPayOrderResponse:
+            properties:
+                pay_config:
+                    $ref: '#/components/schemas/DtoClientPayConfig'
+                payment_method:
+                    description: 支付方式
+                    type: string
+            type: object
         DtoClientRechargeCheckResponse:
             properties:
                 force_recharge_amount:
@@ -22879,6 +22897,78 @@ paths:
             summary: 订单详情
             tags:
                 - 个人客户 - 订单
+    /api/c/v1/orders/{id}/pay:
+        post:
+            parameters:
+                - description: ID
+                  in: path
+                  name: id
+                  required: true
+                  schema:
+                    description: ID
+                    minimum: 0
+                    type: integer
+            requestBody:
+                content:
+                    application/json:
+                        schema:
+                            $ref: '#/components/schemas/DtoClientPayOrderParams'
+            responses:
+                "200":
+                    content:
+                        application/json:
+                            schema:
+                                properties:
+                                    code:
+                                        description: 响应码
+                                        example: 0
+                                        type: integer
+                                    data:
+                                        $ref: '#/components/schemas/DtoClientPayOrderResponse'
+                                    msg:
+                                        description: 响应消息
+                                        example: success
+                                        type: string
+                                    timestamp:
+                                        description: 时间戳
+                                        format: date-time
+                                        type: string
+                                required:
+                                    - code
+                                    - msg
+                                    - data
+                                    - timestamp
+                                type: object
+                    description: 成功
+                "400":
+                    content:
+                        application/json:
+                            schema:
+                                $ref: '#/components/schemas/ErrorResponse'
+                    description: 请求参数错误
+                "401":
+                    content:
+                        application/json:
+                            schema:
+                                $ref: '#/components/schemas/ErrorResponse'
+                    description: 未认证或认证已过期
+                "403":
+                    content:
+                        application/json:
+                            schema:
+                                $ref: '#/components/schemas/ErrorResponse'
+                    description: 无权访问
+                "500":
+                    content:
+                        application/json:
+                            schema:
+                                $ref: '#/components/schemas/ErrorResponse'
+                    description: 服务器内部错误
+            security:
+                - BearerAuth: []
+            summary: 订单支付
+            tags:
+                - 个人客户 - 订单
     /api/c/v1/orders/create:
         post:
             requestBody: