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

internal/controller/health_controller.go

@@ -0,0 +1,22 @@
+package controller
+
+import (
+	"net/http"
+
+	"github.com/labstack/echo/v4"
+
+	"epic-ent/internal/service"
+)
+
+type HealthController struct {
+	svc *service.HealthService
+}
+
+func NewHealthController(svc *service.HealthService) *HealthController {
+	return &HealthController{svc: svc}
+}
+
+func (h *HealthController) Health(c echo.Context) error {
+	status := h.svc.Check()
+	return c.JSON(http.StatusOK, status)
+}