feat(c2c): 支持绿积分(GREEN_POINTS)作为默认支付方式

- 后端 paymentMethod 字段从 PostgreSQL 枚举改为 String，支持逗号分隔多种支付方式
- 添加数据库迁移将 C2cPaymentMethod 枚举列转为 TEXT 类型
- DTO 验证改为 @IsString() 接受 GREEN_POINTS 及其组合
- 前端保持发送完整的支付方式列表（含 GREEN_POINTS）

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/services/trading-service/prisma/migrations/0004_c2c_payment_method_to_string/migration.sql

@@ -0,0 +1,5 @@
+-- AlterTable: Change payment_method from enum to text to support comma-separated values and GREEN_POINTS
+ALTER TABLE "c2c_orders" ALTER COLUMN "payment_method" TYPE TEXT USING "payment_method"::TEXT;
+
+-- DropEnum (only if not used elsewhere)
+DROP TYPE IF EXISTS "C2cPaymentMethod";

backend/services/trading-service/prisma/schema.prisma

@@ -637,13 +637,6 @@ enum C2cOrderStatus {
   EXPIRED    // 已过期
 }
 
-// C2C收款方式
-enum C2cPaymentMethod {
-  ALIPAY   // 支付宝
-  WECHAT   // 微信
-  BANK     // 银行卡
-}
-
 // C2C订单
 model C2cOrder {
   id                    String        @id @default(uuid())
@@ -671,7 +664,7 @@ model C2cOrder {
   maxAmount             Decimal       @default(0) @map("max_amount") @db.Decimal(30, 8) // 最大交易量
 
   // 卖方收款信息（卖单必填，买单买家需提供）
-  paymentMethod         C2cPaymentMethod? @map("payment_method")  // 收款方式
+  paymentMethod         String?           @map("payment_method")  // 收款方式（GREEN_POINTS/ALIPAY/WECHAT/BANK，可逗号分隔）
   paymentAccount        String?       @map("payment_account")      // 收款账号
   paymentQrCode         String?       @map("payment_qr_code")      // 收款二维码URL
   paymentRealName       String?       @map("payment_real_name")    // 收款人实名

backend/services/trading-service/src/api/controllers/c2c.controller.ts

@@ -144,7 +144,7 @@ export class C2cController {
         minAmount: dto.minAmount,
         maxAmount: dto.maxAmount,
         // 收款信息
-        paymentMethod: dto.paymentMethod as any,
+        paymentMethod: dto.paymentMethod,
         paymentAccount: dto.paymentAccount,
         paymentQrCode: dto.paymentQrCode,
         paymentRealName: dto.paymentRealName,
@@ -185,7 +185,7 @@ export class C2cController {
     const order = await this.c2cService.takeOrder(orderNo, accountSequence, {
       quantity: dto.quantity,
       // 收款信息（接买单时由taker提供）
-      paymentMethod: dto.paymentMethod as any,
+      paymentMethod: dto.paymentMethod,
       paymentAccount: dto.paymentAccount,
       paymentQrCode: dto.paymentQrCode,
       paymentRealName: dto.paymentRealName,

backend/services/trading-service/src/api/dto/c2c.dto.ts

@@ -20,6 +20,7 @@ export enum C2cOrderStatus {
 
 // 收款方式
 export enum C2cPaymentMethod {
+  GREEN_POINTS = 'GREEN_POINTS', // 绿积分（默认）
   ALIPAY = 'ALIPAY',   // 支付宝
   WECHAT = 'WECHAT',   // 微信
   BANK = 'BANK',       // 银行卡
@@ -50,11 +51,11 @@ export class CreateC2cOrderDto {
   @IsNumberString()
   maxAmount?: string;
 
-  // 收款信息（卖单必填）
-  @ApiPropertyOptional({ enum: ['ALIPAY', 'WECHAT', 'BANK'], description: '收款方式' })
+  // 收款信息（卖单可选，支持逗号分隔多种方式如 'ALIPAY,WECHAT'）
+  @ApiPropertyOptional({ description: '收款方式（ALIPAY/WECHAT/BANK，可逗号分隔）' })
   @IsOptional()
-  @IsIn(['ALIPAY', 'WECHAT', 'BANK'])
-  paymentMethod?: 'ALIPAY' | 'WECHAT' | 'BANK';
+  @IsString()
+  paymentMethod?: string;
 
   @ApiPropertyOptional({ description: '收款账号' })
   @IsOptional()
@@ -84,10 +85,10 @@ export class TakeC2cOrderDto {
   quantity?: string;
 
   // 买单被接单时，买家需要提供收款信息
-  @ApiPropertyOptional({ enum: ['ALIPAY', 'WECHAT', 'BANK'], description: '收款方式（接买单时需提供）' })
+  @ApiPropertyOptional({ description: '收款方式（GREEN_POINTS/ALIPAY/WECHAT/BANK，可逗号分隔）' })
   @IsOptional()
-  @IsIn(['ALIPAY', 'WECHAT', 'BANK'])
-  paymentMethod?: 'ALIPAY' | 'WECHAT' | 'BANK';
+  @IsString()
+  paymentMethod?: string;
 
   @ApiPropertyOptional({ description: '收款账号（接买单时需提供）' })
   @IsOptional()

backend/services/trading-service/src/application/services/c2c.service.ts

@@ -25,13 +25,12 @@ const C2C_ORDER_STATUS = {
 
 // C2C 收款方式常量
 const C2C_PAYMENT_METHOD = {
+  GREEN_POINTS: 'GREEN_POINTS',
   ALIPAY: 'ALIPAY',
   WECHAT: 'WECHAT',
   BANK: 'BANK',
 } as const;
 
-type C2cPaymentMethod = typeof C2C_PAYMENT_METHOD[keyof typeof C2C_PAYMENT_METHOD];
-
 // 默认超时时间配置（分钟）
 const DEFAULT_PAYMENT_TIMEOUT_MINUTES = 15;
 const DEFAULT_CONFIRM_TIMEOUT_MINUTES = 60;
@@ -84,7 +83,7 @@ export class C2cService {
       minAmount?: string;
       maxAmount?: string;
       // 收款信息（卖单必填）
-      paymentMethod?: C2cPaymentMethod;
+      paymentMethod?: string;
       paymentAccount?: string;
       paymentQrCode?: string;
       paymentRealName?: string;
@@ -188,7 +187,7 @@ export class C2cService {
     options?: {
       quantity?: string;
       // 收款信息（接买单时由taker提供，因为taker是卖方）
-      paymentMethod?: C2cPaymentMethod;
+      paymentMethod?: string;
       paymentAccount?: string;
       paymentQrCode?: string;
       paymentRealName?: string;

backend/services/trading-service/src/infrastructure/persistence/repositories/c2c-order.repository.ts

@@ -17,16 +17,8 @@ const C2C_ORDER_STATUS = {
   EXPIRED: 'EXPIRED',
 } as const;
 
-// C2C 收款方式常量
-const C2C_PAYMENT_METHOD = {
-  ALIPAY: 'ALIPAY',
-  WECHAT: 'WECHAT',
-  BANK: 'BANK',
-} as const;
-
 type C2cOrderType = typeof C2C_ORDER_TYPE[keyof typeof C2C_ORDER_TYPE];
 type C2cOrderStatus = typeof C2C_ORDER_STATUS[keyof typeof C2C_ORDER_STATUS];
-type C2cPaymentMethod = typeof C2C_PAYMENT_METHOD[keyof typeof C2C_PAYMENT_METHOD];
 
 export interface C2cOrderEntity {
   id: string;
@@ -47,7 +39,7 @@ export interface C2cOrderEntity {
   minAmount: string;
   maxAmount: string;
   // 收款信息
-  paymentMethod?: C2cPaymentMethod | null;
+  paymentMethod?: string | null;
   paymentAccount?: string | null;
   paymentQrCode?: string | null;
   paymentRealName?: string | null;
@@ -107,7 +99,7 @@ export class C2cOrderRepository {
     minAmount?: string;
     maxAmount?: string;
     // 收款信息
-    paymentMethod?: C2cPaymentMethod;
+    paymentMethod?: string;
     paymentAccount?: string;
     paymentQrCode?: string;
     paymentRealName?: string;
@@ -130,7 +122,7 @@ export class C2cOrderRepository {
         minAmount: data.minAmount || '0',
         maxAmount: data.maxAmount || '0',
         // 收款信息
-        paymentMethod: data.paymentMethod as any,
+        paymentMethod: data.paymentMethod,
         paymentAccount: data.paymentAccount,
         paymentQrCode: data.paymentQrCode,
         paymentRealName: data.paymentRealName,
@@ -154,7 +146,7 @@ export class C2cOrderRepository {
       takerPhone: string;
       takerNickname: string;
       // 收款信息（接买单时由taker提供）
-      paymentMethod: C2cPaymentMethod;
+      paymentMethod: string;
       paymentAccount: string;
       paymentQrCode: string;
       paymentRealName: string;
@@ -174,7 +166,6 @@ export class C2cOrderRepository {
       data: {
         status: status as any,
         ...additionalData,
-        paymentMethod: additionalData?.paymentMethod as any,
       },
     });
     return this.toEntity(record);
@@ -352,7 +343,7 @@ export class C2cOrderRepository {
       minAmount: record.minAmount.toString(),
       maxAmount: record.maxAmount.toString(),
       // 收款信息
-      paymentMethod: record.paymentMethod as C2cPaymentMethod | null,
+      paymentMethod: record.paymentMethod,
       paymentAccount: record.paymentAccount,
       paymentQrCode: record.paymentQrCode,
       paymentRealName: record.paymentRealName,