feat: 添加交易记录的创建和查询API处理器

internal/handler/transaction_handler.go

@@ -148,6 +148,10 @@ func (h *TransactionHandler) GetTransactions(c *gin.Context) {
 			api.BadRequest(c, "Invalid end_date format. Use YYYY-MM-DD or RFC3339 format")
 			return
 		}
+		// If input is just a date (YYYY-MM-DD), set it to the end of that day to be inclusive
+		if len(endDateStr) == 10 {
+			endDate = time.Date(endDate.Year(), endDate.Month(), endDate.Day(), 23, 59, 59, 999999999, endDate.Location())
+		}
 		input.EndDate = &endDate
 	}