feat: establish NekoNest Cloud control and relay

relay/internal/tenantstore/util.go

@@ -0,0 +1,29 @@
+package tenantstore
+
+import (
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+)
+
+func generateToken() string {
+	b := make([]byte, 32)
+	if _, err := rand.Read(b); err != nil {
+		return ""
+	}
+	return hex.EncodeToString(b)
+}
+
+func hashToken(token string) string {
+	h := sha256.Sum256([]byte(token))
+	return hex.EncodeToString(h[:])
+}
+
+func marshalJSON(v any) ([]byte, error) {
+	return json.Marshal(v)
+}
+
+func unmarshalJSON(data []byte, v any) error {
+	return json.Unmarshal(data, v)
+}