refactor: controllers and routes

backend/internal/controllers/service.go

@@ -0,0 +1,11 @@
+package controllers
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+)
+
+func HealthCheck(c *gin.Context) {
+	c.JSON(http.StatusOK, gin.H{"status": "ok"})
+}