feat(backend): add kiro account support

backend/internal/pkg/kirocooldown/store_test.go

@@ -0,0 +1,32 @@
+package kirocooldown
+
+import (
+	"context"
+	"testing"
+
+	"github.com/redis/go-redis/v9"
+)
+
+func TestClearEarliestTransientCooldownEmptyKeysIsSafe(t *testing.T) {
+	store := NewStore(redis.NewClient(&redis.Options{Addr: "127.0.0.1:0"}))
+
+	cleared, err := store.ClearEarliestTransientCooldown(context.Background(), nil)
+	if err != nil {
+		t.Fatalf("ClearEarliestTransientCooldown(nil) error = %v", err)
+	}
+	if cleared {
+		t.Fatal("ClearEarliestTransientCooldown(nil) cleared = true, want false")
+	}
+}
+
+func TestClearEarliestTransientCooldownUnavailableStore(t *testing.T) {
+	store := NewStore(nil)
+
+	cleared, err := store.ClearEarliestTransientCooldown(context.Background(), []string{"token"})
+	if err == nil {
+		t.Fatal("ClearEarliestTransientCooldown unavailable store error = nil")
+	}
+	if cleared {
+		t.Fatal("ClearEarliestTransientCooldown unavailable store cleared = true, want false")
+	}
+}