feat(auth): centralize token store management and enhance persistence

- Introduced `RegisterTokenStore` and `GetTokenStore` to centralize token store access.
- Replaced direct file operations with a unified token persistence API.
- Updated all components to use the shared token store for consistent behavior.
- Improved logging for token save operations to include file paths.

internal/cmd/auth_manager.go

@@ -11,7 +11,7 @@ import (
 // Returns:
 //   - *sdkAuth.Manager: A configured authentication manager instance
 func newAuthManager() *sdkAuth.Manager {
-	store := sdkAuth.NewFileTokenStore()
+	store := sdkAuth.GetTokenStore()
 	manager := sdkAuth.NewManager(store,
 		sdkAuth.NewGeminiAuthenticator(),
 		sdkAuth.NewCodexAuthenticator(),

internal/cmd/gemini-web_auth.go

@@ -3,15 +3,16 @@ package cmd
 
 import (
 	"bufio"
+	"context"
 	"crypto/sha256"
 	"encoding/hex"
 	"fmt"
 	"os"
-	"path/filepath"
 	"strings"
 
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/auth/gemini"
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/config"
+	sdkAuth "github.com/router-for-me/CLIProxyAPI/v6/sdk/auth"
 	log "github.com/sirupsen/logrus"
 )
 
@@ -48,13 +49,17 @@ func DoGeminiWebAuth(cfg *config.Config) {
 	hasher.Write([]byte(secure1psid))
 	hash := hex.EncodeToString(hasher.Sum(nil))
 	fileName := fmt.Sprintf("gemini-web-%s.json", hash[:16])
-	filePath := filepath.Join(cfg.AuthDir, fileName)
-
-	err := tokenStorage.SaveTokenToFile(filePath)
+	record := &sdkAuth.TokenRecord{
+		Provider: "gemini-web",
+		FileName: fileName,
+		Storage:  tokenStorage,
+	}
+	store := sdkAuth.GetTokenStore()
+	savedPath, err := store.Save(context.Background(), cfg, record)
 	if err != nil {
 		log.Fatalf("Failed to save Gemini Web token to file: %v", err)
 		return
 	}
 
-	log.Infof("Successfully saved Gemini Web token to: %s", filePath)
+	log.Infof("Successfully saved Gemini Web token to: %s", savedPath)
 }