feat(i18n): apply ORY bypass whitelist policy and add error-code tests

backend/cmd/server/error_handler.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"baron-sso-backend/internal/response"
+	"errors"
+	"log/slog"
+
+	"github.com/gofiber/fiber/v2"
+)
+
+func newErrorHandler(appEnv string) fiber.ErrorHandler {
+	return func(c *fiber.Ctx, err error) error {
+		code := fiber.StatusInternalServerError
+
+		var e *fiber.Error
+		if errors.As(err, &e) {
+			code = e.Code
+		}
+
+		if appEnv == "production" || appEnv == "stage" {
+			if code >= 500 {
+				slog.Error("Internal Server Error",
+					"error", err.Error(),
+					"path", c.Path(),
+					"method", c.Method(),
+				)
+				return response.Error(c, code, response.StatusCode(code), "Internal Server Error")
+			}
+		}
+
+		return response.Error(c, code, response.StatusCode(code), err.Error())
+	}
+}