add initial application structure with configuration, logging, and health check endpoints

internal/exception/handler.go

@@ -1,14 +1,24 @@
 package exception
 
 import (
+	"net/http"
+
 	"github.com/labstack/echo/v4"
+
+	"epic-ent/internal/domain/vo"
 )
 
 func RegisterErrorHandler(e *echo.Echo) {
 	e.HTTPErrorHandler = func(err error, c echo.Context) {
-		_ = c.JSON(500, map[string]any{
-			"code":    "INTERNAL_ERROR",
-			"message": err.Error(),
-		})
+		code := http.StatusInternalServerError
+		msg := err.Error()
+		if he, ok := err.(*echo.HTTPError); ok {
+			code = he.Code
+			if he.Message != nil {
+				msg = he.Message.(string)
+			}
+		}
+
+		_ = c.JSON(code, vo.Error(msg))
 	}
 }