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/services/content_test.go

@@ -224,14 +224,14 @@ func (s *ContentTestSuite) Test_HasAccess() {
 
 		Convey("权益 active 应返回 true", func() {
 			access := &models.ContentAccess{
-				TenantID:   tenantID,
-				UserID:     userID,
-				ContentID:  content.ID,
-				OrderID:    0,
-				Status:     consts.ContentAccessStatusActive,
-				RevokedAt:  time.Time{},
-				CreatedAt:  now,
-				UpdatedAt:  now,
+				TenantID:  tenantID,
+				UserID:    userID,
+				ContentID: content.ID,
+				OrderID:   0,
+				Status:    consts.ContentAccessStatusActive,
+				RevokedAt: time.Time{},
+				CreatedAt: now,
+				UpdatedAt: now,
 			}
 			So(access.Create(ctx), ShouldBeNil)
 
@@ -241,4 +241,3 @@ func (s *ContentTestSuite) Test_HasAccess() {
 		})
 	})
 }
-