feat(auth): add support for persisting disabled flag in token storage

- Updated `FileTokenStore` and related stores (`objectstore`, `gitstore`, `postgresstore`) to include the `disabled` flag in metadata for token storage.
- Adjusted `Auth` metadata handling to initialize empty maps when absent.
- Refined logic in `auto_refresh_loop` and `conductor` to exclude `disabled` tokens from refresh checks.
- Added comprehensive unit tests to verify proper handling of the `disabled` flag in storage and retrieval operations.

sdk/auth/filestore_disabled_test.go

@@ -0,0 +1,64 @@
+package auth
+
+import (
+	"context"
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"testing"
+
+	cliproxyauth "github.com/router-for-me/CLIProxyAPI/v7/sdk/cliproxy/auth"
+)
+
+type testTokenStorage struct {
+	meta map[string]any
+}
+
+func (s *testTokenStorage) SetMetadata(meta map[string]any) { s.meta = meta }
+
+func (s *testTokenStorage) SaveTokenToFile(authFilePath string) error {
+	raw, err := json.Marshal(s.meta)
+	if err != nil {
+		return err
+	}
+	return os.WriteFile(authFilePath, raw, 0o600)
+}
+
+func TestFileTokenStore_Save_DisabledPersistsFlagForTokenStorage(t *testing.T) {
+	ctx := context.Background()
+	baseDir := t.TempDir()
+	path := filepath.Join(baseDir, "disabled.json")
+
+	if err := os.WriteFile(path, []byte(`{"type":"test","disabled":true}`), 0o600); err != nil {
+		t.Fatalf("seed auth file: %v", err)
+	}
+
+	store := NewFileTokenStore()
+	store.SetBaseDir(baseDir)
+	storage := &testTokenStorage{}
+
+	auth := &cliproxyauth.Auth{
+		ID:       "disabled.json",
+		Provider: "test",
+		FileName: "disabled.json",
+		Disabled: true,
+		Storage:  storage,
+		Metadata: map[string]any{"type": "test"},
+	}
+
+	if _, err := store.Save(ctx, auth); err != nil {
+		t.Fatalf("Save() error: %v", err)
+	}
+
+	raw, err := os.ReadFile(path)
+	if err != nil {
+		t.Fatalf("read auth file: %v", err)
+	}
+	var meta map[string]any
+	if err := json.Unmarshal(raw, &meta); err != nil {
+		t.Fatalf("unmarshal auth file: %v", err)
+	}
+	if disabled, _ := meta["disabled"].(bool); !disabled {
+		t.Fatalf("disabled=%v, want true (raw=%s)", meta["disabled"], string(raw))
+	}
+}