feat: add balance and ledger endpoints for tenant

- Implemented MyBalance and MyLedgerPage methods in the ledger service to retrieve current user balance and transaction history for a specified tenant.
- Added corresponding test cases for MyBalance and MyLedgerPage methods in the ledger test suite.
- Created DTOs for balance response and ledger items to structure the response data.
- Updated Swagger documentation to include new endpoints for retrieving tenant balance and ledgers.
- Added HTTP tests for the new endpoints to ensure proper functionality.

backend/app/http/tenant/dto/ledger_me.go

@@ -0,0 +1,31 @@
+package dto
+
+import (
+	"time"
+
+	"quyun/v2/app/requests"
+	"quyun/v2/database/models"
+	"quyun/v2/pkg/consts"
+)
+
+// MyLedgerListFilter 定义“我的余额流水”查询条件。
+type MyLedgerListFilter struct {
+	// Pagination 分页参数（page/limit）。
+	requests.Pagination `json:",inline" query:",inline"`
+	// Type 按流水类型过滤（可选）。
+	Type *consts.TenantLedgerType `json:"type,omitempty" query:"type"`
+	// OrderID 按关联订单过滤（可选）。
+	OrderID *int64 `json:"order_id,omitempty" query:"order_id"`
+	// CreatedAtFrom 创建时间起（可选）。
+	CreatedAtFrom *time.Time `json:"created_at_from,omitempty" query:"created_at_from"`
+	// CreatedAtTo 创建时间止（可选）。
+	CreatedAtTo *time.Time `json:"created_at_to,omitempty" query:"created_at_to"`
+}
+
+// MyLedgerItem 返回一条余额流水，并补充展示字段。
+type MyLedgerItem struct {
+	// Ledger 流水记录（租户内隔离）。
+	Ledger *models.TenantLedger `json:"ledger"`
+	// TypeDescription 流水类型中文说明（用于前端展示）。
+	TypeDescription string `json:"type_description"`
+}