Refactor controllers to remove unnecessary return statements after JSON responses

- Removed redundant return statements in various controller functions across the dashboard module.
- This change improves code readability and maintains the same functionality.

internal/controllers/dashboard/dashboard_controller.go

@@ -12,5 +12,4 @@ import (
 func DashboardGetOverview(ctx *gin.Context) {
 	rangeValue, _ := params.Get(ctx, "range")
 	httpx.WriteJSON(ctx, services.DashboardService.GetOverview(rangeValue))
-	return
 }