feat: migrate Flask API to Go with JWT auth

pkg/utils/utils.go

@@ -0,0 +1,16 @@
+package utils
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+func JSONResponse(w http.ResponseWriter, code int, payload interface{}) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(code)
+	json.NewEncoder(w).Encode(payload)
+}
+
+func JSONError(w http.ResponseWriter, code int, message string) {
+	JSONResponse(w, code, map[string]string{"error": message})
+}