feat(antigravity): 添加配额窗口显示功能

后端:
- 新增 AntigravityQuotaRefresher 定时刷新配额
- Client 添加 FetchAvailableModels 方法获取模型配额
- 配额数据存入 account.extra.quota 字段

前端:
- AccountUsageCell 支持显示 Antigravity 账户配额
- UsageProgressBar 新增 amber 颜色
- 显示 G3P/G3F/G3I/C4.5 四个配额进度条

backend/cmd/server/wire.go

@@ -71,6 +71,7 @@ func provideCleanup(
 	openaiOAuth *service.OpenAIOAuthService,
 	geminiOAuth *service.GeminiOAuthService,
 	antigravityOAuth *service.AntigravityOAuthService,
+	antigravityQuota *service.AntigravityQuotaRefresher,
 ) func() {
 	return func() {
 		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
@@ -109,6 +110,10 @@ func provideCleanup(
 				antigravityOAuth.Stop()
 				return nil
 			}},
+			{"AntigravityQuotaRefresher", func() error {
+				antigravityQuota.Stop()
+				return nil
+			}},
 			{"Redis", func() error {
 				return rdb.Close()
 			}},

backend/cmd/server/wire_gen.go

@@ -136,7 +136,8 @@ func initializeApplication(buildInfo handler.BuildInfo) (*Application, error) {
 	engine := server.ProvideRouter(configConfig, handlers, jwtAuthMiddleware, adminAuthMiddleware, apiKeyAuthMiddleware, apiKeyService, subscriptionService)
 	httpServer := server.ProvideHTTPServer(configConfig, engine)
 	tokenRefreshService := service.ProvideTokenRefreshService(accountRepository, oAuthService, openAIOAuthService, geminiOAuthService, antigravityOAuthService, configConfig)
-	v := provideCleanup(db, client, tokenRefreshService, pricingService, emailQueueService, oAuthService, openAIOAuthService, geminiOAuthService, antigravityOAuthService)
+	antigravityQuotaRefresher := service.ProvideAntigravityQuotaRefresher(accountRepository, proxyRepository, antigravityOAuthService, configConfig)
+	v := provideCleanup(db, client, tokenRefreshService, pricingService, emailQueueService, oAuthService, openAIOAuthService, geminiOAuthService, antigravityOAuthService, antigravityQuotaRefresher)
 	application := &Application{
 		Server:  httpServer,
 		Cleanup: v,
@@ -168,6 +169,7 @@ func provideCleanup(
 	openaiOAuth *service.OpenAIOAuthService,
 	geminiOAuth *service.GeminiOAuthService,
 	antigravityOAuth *service.AntigravityOAuthService,
+	antigravityQuota *service.AntigravityQuotaRefresher,
 ) func() {
 	return func() {
 		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
@@ -205,6 +207,10 @@ func provideCleanup(
 				antigravityOAuth.Stop()
 				return nil
 			}},
+			{"AntigravityQuotaRefresher", func() error {
+				antigravityQuota.Stop()
+				return nil
+			}},
 			{"Redis", func() error {
 				return rdb.Close()
 			}},

backend/internal/pkg/antigravity/client.go

@@ -214,3 +214,64 @@ func (c *Client) LoadCodeAssist(ctx context.Context, accessToken string) (*LoadC
 
 	return &loadResp, nil
 }
+
+// ModelQuotaInfo 模型配额信息
+type ModelQuotaInfo struct {
+	RemainingFraction float64 `json:"remainingFraction"`
+	ResetTime         string  `json:"resetTime,omitempty"`
+}
+
+// ModelInfo 模型信息
+type ModelInfo struct {
+	QuotaInfo *ModelQuotaInfo `json:"quotaInfo,omitempty"`
+}
+
+// FetchAvailableModelsRequest fetchAvailableModels 请求
+type FetchAvailableModelsRequest struct {
+	Project string `json:"project"`
+}
+
+// FetchAvailableModelsResponse fetchAvailableModels 响应
+type FetchAvailableModelsResponse struct {
+	Models map[string]ModelInfo `json:"models"`
+}
+
+// FetchAvailableModels 获取可用模型和配额信息
+func (c *Client) FetchAvailableModels(ctx context.Context, accessToken, projectID string) (*FetchAvailableModelsResponse, error) {
+	reqBody := FetchAvailableModelsRequest{Project: projectID}
+	bodyBytes, err := json.Marshal(reqBody)
+	if err != nil {
+		return nil, fmt.Errorf("序列化请求失败: %w", err)
+	}
+
+	apiURL := BaseURL + "/v1internal:fetchAvailableModels"
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, apiURL, strings.NewReader(string(bodyBytes)))
+	if err != nil {
+		return nil, fmt.Errorf("创建请求失败: %w", err)
+	}
+	req.Header.Set("Authorization", "Bearer "+accessToken)
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("User-Agent", UserAgent)
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("fetchAvailableModels 请求失败: %w", err)
+	}
+	defer func() { _ = resp.Body.Close() }()
+
+	respBodyBytes, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("读取响应失败: %w", err)
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("fetchAvailableModels 失败 (HTTP %d): %s", resp.StatusCode, string(respBodyBytes))
+	}
+
+	var modelsResp FetchAvailableModelsResponse
+	if err := json.Unmarshal(respBodyBytes, &modelsResp); err != nil {
+		return nil, fmt.Errorf("响应解析失败: %w", err)
+	}
+
+	return &modelsResp, nil
+}

backend/internal/service/antigravity_quota_refresher.go

@@ -0,0 +1,203 @@
+package service
+
+import (
+	"context"
+	"log"
+	"sync"
+	"time"
+
+	"github.com/Wei-Shaw/sub2api/internal/config"
+	"github.com/Wei-Shaw/sub2api/internal/pkg/antigravity"
+)
+
+// AntigravityQuotaRefresher 定时刷新 Antigravity 账户的配额信息
+type AntigravityQuotaRefresher struct {
+	accountRepo AccountRepository
+	proxyRepo   ProxyRepository
+	oauthSvc    *AntigravityOAuthService
+	cfg         *config.TokenRefreshConfig
+
+	stopCh chan struct{}
+	wg     sync.WaitGroup
+}
+
+// NewAntigravityQuotaRefresher 创建配额刷新器
+func NewAntigravityQuotaRefresher(
+	accountRepo AccountRepository,
+	proxyRepo ProxyRepository,
+	oauthSvc *AntigravityOAuthService,
+	cfg *config.Config,
+) *AntigravityQuotaRefresher {
+	return &AntigravityQuotaRefresher{
+		accountRepo: accountRepo,
+		proxyRepo:   proxyRepo,
+		oauthSvc:    oauthSvc,
+		cfg:         &cfg.TokenRefresh,
+		stopCh:      make(chan struct{}),
+	}
+}
+
+// Start 启动后台配额刷新服务
+func (r *AntigravityQuotaRefresher) Start() {
+	if !r.cfg.Enabled {
+		log.Println("[AntigravityQuota] Service disabled by configuration")
+		return
+	}
+
+	r.wg.Add(1)
+	go r.refreshLoop()
+
+	log.Printf("[AntigravityQuota] Service started (check every %d minutes)", r.cfg.CheckIntervalMinutes)
+}
+
+// Stop 停止服务
+func (r *AntigravityQuotaRefresher) Stop() {
+	close(r.stopCh)
+	r.wg.Wait()
+	log.Println("[AntigravityQuota] Service stopped")
+}
+
+// refreshLoop 刷新循环
+func (r *AntigravityQuotaRefresher) refreshLoop() {
+	defer r.wg.Done()
+
+	checkInterval := time.Duration(r.cfg.CheckIntervalMinutes) * time.Minute
+	if checkInterval < time.Minute {
+		checkInterval = 5 * time.Minute
+	}
+
+	ticker := time.NewTicker(checkInterval)
+	defer ticker.Stop()
+
+	// 启动时立即执行一次
+	r.processRefresh()
+
+	for {
+		select {
+		case <-ticker.C:
+			r.processRefresh()
+		case <-r.stopCh:
+			return
+		}
+	}
+}
+
+// processRefresh 执行一次刷新
+func (r *AntigravityQuotaRefresher) processRefresh() {
+	ctx := context.Background()
+
+	// 查询所有 active 的账户，然后过滤 antigravity 平台
+	allAccounts, err := r.accountRepo.ListActive(ctx)
+	if err != nil {
+		log.Printf("[AntigravityQuota] Failed to list accounts: %v", err)
+		return
+	}
+
+	// 过滤 antigravity 平台账户
+	var accounts []Account
+	for _, acc := range allAccounts {
+		if acc.Platform == PlatformAntigravity {
+			accounts = append(accounts, acc)
+		}
+	}
+
+	if len(accounts) == 0 {
+		return
+	}
+
+	refreshed, failed := 0, 0
+
+	for i := range accounts {
+		account := &accounts[i]
+
+		if err := r.refreshAccountQuota(ctx, account); err != nil {
+			log.Printf("[AntigravityQuota] Account %d (%s) failed: %v", account.ID, account.Name, err)
+			failed++
+		} else {
+			refreshed++
+		}
+	}
+
+	log.Printf("[AntigravityQuota] Cycle complete: total=%d, refreshed=%d, failed=%d",
+		len(accounts), refreshed, failed)
+}
+
+// refreshAccountQuota 刷新单个账户的配额
+func (r *AntigravityQuotaRefresher) refreshAccountQuota(ctx context.Context, account *Account) error {
+	accessToken := account.GetCredential("access_token")
+	projectID := account.GetCredential("project_id")
+
+	if accessToken == "" || projectID == "" {
+		return nil // 没有有效凭证，跳过
+	}
+
+	// 检查 token 是否过期，过期则刷新
+	if r.isTokenExpired(account) {
+		tokenInfo, err := r.oauthSvc.RefreshAccountToken(ctx, account)
+		if err != nil {
+			return err
+		}
+		accessToken = tokenInfo.AccessToken
+		// 更新凭证
+		account.Credentials = r.oauthSvc.BuildAccountCredentials(tokenInfo)
+	}
+
+	// 获取代理 URL
+	var proxyURL string
+	if account.ProxyID != nil {
+		proxy, err := r.proxyRepo.GetByID(ctx, *account.ProxyID)
+		if err == nil && proxy != nil {
+			proxyURL = proxy.URL()
+		}
+	}
+
+	// 调用 API 获取配额
+	client := antigravity.NewClient(proxyURL)
+	modelsResp, err := client.FetchAvailableModels(ctx, accessToken, projectID)
+	if err != nil {
+		return err
+	}
+
+	// 解析配额数据并更新 extra 字段
+	r.updateAccountQuota(account, modelsResp)
+
+	// 保存到数据库
+	return r.accountRepo.Update(ctx, account)
+}
+
+// isTokenExpired 检查 token 是否过期
+func (r *AntigravityQuotaRefresher) isTokenExpired(account *Account) bool {
+	expiresAt := parseAntigravityExpiresAt(account)
+	if expiresAt == nil {
+		return false
+	}
+
+	// 提前 5 分钟认为过期
+	return time.Now().Add(5 * time.Minute).After(*expiresAt)
+}
+
+// updateAccountQuota 更新账户的配额信息
+func (r *AntigravityQuotaRefresher) updateAccountQuota(account *Account, modelsResp *antigravity.FetchAvailableModelsResponse) {
+	if account.Extra == nil {
+		account.Extra = make(map[string]any)
+	}
+
+	quota := make(map[string]any)
+
+	for modelName, modelInfo := range modelsResp.Models {
+		if modelInfo.QuotaInfo == nil {
+			continue
+		}
+
+		// 转换 remainingFraction (0.0-1.0) 为百分比 (0-100)
+		remaining := int(modelInfo.QuotaInfo.RemainingFraction * 100)
+
+		quota[modelName] = map[string]any{
+			"remaining":  remaining,
+			"reset_time": modelInfo.QuotaInfo.ResetTime,
+		}
+	}
+
+	account.Extra["quota"] = quota
+	account.Extra["last_quota_check"] = time.Now().Format(time.RFC3339)
+}

backend/internal/service/wire.go

@@ -54,6 +54,18 @@ func ProvideTimingWheelService() *TimingWheelService {
 	return svc
 }
 
+// ProvideAntigravityQuotaRefresher creates and starts AntigravityQuotaRefresher
+func ProvideAntigravityQuotaRefresher(
+	accountRepo AccountRepository,
+	proxyRepo ProxyRepository,
+	oauthSvc *AntigravityOAuthService,
+	cfg *config.Config,
+) *AntigravityQuotaRefresher {
+	svc := NewAntigravityQuotaRefresher(accountRepo, proxyRepo, oauthSvc, cfg)
+	svc.Start()
+	return svc
+}
+
 // ProvideDeferredService creates and starts DeferredService
 func ProvideDeferredService(accountRepo AccountRepository, timingWheel *TimingWheelService) *DeferredService {
 	svc := NewDeferredService(accountRepo, timingWheel, 10*time.Second)
@@ -102,4 +114,5 @@ var ProviderSet = wire.NewSet(
 	ProvideTokenRefreshService,
 	ProvideTimingWheelService,
 	ProvideDeferredService,
+	ProvideAntigravityQuotaRefresher,
 )