refactor: standardize sorting direction constants and JSON annotations

- Updated DESCENDING constant from "dsc" to "desc" for clarity and consistency.
- Changed JSON annotation for Direction field in Sort struct from "d" to "direction" to improve readability and maintainability.
- Ensured alignment with existing coding standards and practices across the codebase.

core/constants/common.go

@@ -2,5 +2,5 @@ package constants
 
 const (
 	ASCENDING  = "asc"
-	DESCENDING = "dsc"
+	DESCENDING = "desc"
 )

core/entity/sort.go

@@ -2,5 +2,5 @@ package entity
 
 type Sort struct {
 	Key       string `json:"key"`
-	Direction string `json:"d"`
+	Direction string `json:"direction"`
 }