feat(errors): 添加充值和代购相关错误码

- 充值相关: CodeRechargeAmountInvalid (1120), CodeRechargeNotFound (1121), CodeRechargeAlreadyPaid (1122)
- 代购相关: CodePurchaseOnBehalfForbidden (1130), CodePurchaseOnBehalfInvalidTarget (1131)
- 强充验证: CodeForceRechargeRequired (1140), CodeForceRechargeAmountMismatch (1141)

pkg/errors/codes.go

@@ -103,6 +103,19 @@ const (
 	CodeGatewayTimeout      = 1113 // 请求超时
 	CodeGatewayInvalidResp  = 1114 // 响应格式错误
 
+	// 充值相关错误 (1120-1129)
+	CodeRechargeAmountInvalid = 1120 // 充值金额不符合要求
+	CodeRechargeNotFound      = 1121 // 充值订单不存在
+	CodeRechargeAlreadyPaid   = 1122 // 充值订单已支付
+
+	// 代购相关错误 (1130-1139)
+	CodePurchaseOnBehalfForbidden     = 1130 // 无权使用线下支付
+	CodePurchaseOnBehalfInvalidTarget = 1131 // 代购目标无效
+
+	// 强充验证相关错误 (1140-1149)
+	CodeForceRechargeRequired       = 1140 // 必须充值指定金额
+	CodeForceRechargeAmountMismatch = 1141 // 强充金额不匹配
+
 	// 服务端错误 (2000-2999) -> 5xx HTTP 状态码
 	CodeInternalError      = 2001 // 内部服务器错误
 	CodeDatabaseError      = 2002 // 数据库错误
@@ -194,6 +207,13 @@ var allErrorCodes = []int{
 	CodeGatewaySignError,
 	CodeGatewayTimeout,
 	CodeGatewayInvalidResp,
+	CodeRechargeAmountInvalid,
+	CodeRechargeNotFound,
+	CodeRechargeAlreadyPaid,
+	CodePurchaseOnBehalfForbidden,
+	CodePurchaseOnBehalfInvalidTarget,
+	CodeForceRechargeRequired,
+	CodeForceRechargeAmountMismatch,
 	CodeInternalError,
 	CodeDatabaseError,
 	CodeRedisError,
@@ -283,6 +303,13 @@ var errorMessages = map[int]string{
 	CodeGatewaySignError:                  "签名生成失败",
 	CodeGatewayTimeout:                    "Gateway 请求超时",
 	CodeGatewayInvalidResp:                "Gateway 响应格式错误",
+	CodeRechargeAmountInvalid:             "充值金额不符合要求",
+	CodeRechargeNotFound:                  "充值订单不存在",
+	CodeRechargeAlreadyPaid:               "充值订单已支付",
+	CodePurchaseOnBehalfForbidden:         "无权使用线下支付",
+	CodePurchaseOnBehalfInvalidTarget:     "代购目标无效",
+	CodeForceRechargeRequired:             "必须充值指定金额",
+	CodeForceRechargeAmountMismatch:       "强充金额不匹配",
 	CodeInvalidCredentials:                "用户名或密码错误",
 	CodeAccountLocked:                     "账号已锁定",
 	CodePasswordExpired:                   "密码已过期",