feat: 品牌重命名 Sub2API -> TianShuAPI

- 前端: 所有界面显示、i18n 文本、组件中的品牌名称
- 后端: 服务层、设置默认值、邮件模板、安装向导
- 数据库: 迁移脚本注释
- 保持功能完全一致，仅更改品牌名称

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

backend/internal/service/antigravity_token_refresher.go

@@ -1,65 +1,65 @@
-package service
-
-import (
-	"context"
-	"fmt"
-	"time"
-)
-
-const (
-	// antigravityRefreshWindow Antigravity token 提前刷新窗口：15分钟
-	// Google OAuth token 有效期55分钟，提前15分钟刷新
-	antigravityRefreshWindow = 15 * time.Minute
-)
-
-// AntigravityTokenRefresher 实现 TokenRefresher 接口
-type AntigravityTokenRefresher struct {
-	antigravityOAuthService *AntigravityOAuthService
-}
-
-func NewAntigravityTokenRefresher(antigravityOAuthService *AntigravityOAuthService) *AntigravityTokenRefresher {
-	return &AntigravityTokenRefresher{
-		antigravityOAuthService: antigravityOAuthService,
-	}
-}
-
-// CanRefresh 检查是否可以刷新此账户
-func (r *AntigravityTokenRefresher) CanRefresh(account *Account) bool {
-	return account.Platform == PlatformAntigravity && account.Type == AccountTypeOAuth
-}
-
-// NeedsRefresh 检查账户是否需要刷新
-// Antigravity 使用固定的15分钟刷新窗口，忽略全局配置
-func (r *AntigravityTokenRefresher) NeedsRefresh(account *Account, _ time.Duration) bool {
-	if !r.CanRefresh(account) {
-		return false
-	}
-	expiresAt := account.GetCredentialAsTime("expires_at")
-	if expiresAt == nil {
-		return false
-	}
-	timeUntilExpiry := time.Until(*expiresAt)
-	needsRefresh := timeUntilExpiry < antigravityRefreshWindow
-	if needsRefresh {
-		fmt.Printf("[AntigravityTokenRefresher] Account %d needs refresh: expires_at=%s, time_until_expiry=%v, window=%v\n",
-			account.ID, expiresAt.Format("2006-01-02 15:04:05"), timeUntilExpiry, antigravityRefreshWindow)
-	}
-	return needsRefresh
-}
-
-// Refresh 执行 token 刷新
-func (r *AntigravityTokenRefresher) Refresh(ctx context.Context, account *Account) (map[string]any, error) {
-	tokenInfo, err := r.antigravityOAuthService.RefreshAccountToken(ctx, account)
-	if err != nil {
-		return nil, err
-	}
-
-	newCredentials := r.antigravityOAuthService.BuildAccountCredentials(tokenInfo)
-	for k, v := range account.Credentials {
-		if _, exists := newCredentials[k]; !exists {
-			newCredentials[k] = v
-		}
-	}
-
-	return newCredentials, nil
-}
+package service
+
+import (
+	"context"
+	"fmt"
+	"time"
+)
+
+const (
+	// antigravityRefreshWindow Antigravity token 提前刷新窗口：15分钟
+	// Google OAuth token 有效期55分钟，提前15分钟刷新
+	antigravityRefreshWindow = 15 * time.Minute
+)
+
+// AntigravityTokenRefresher 实现 TokenRefresher 接口
+type AntigravityTokenRefresher struct {
+	antigravityOAuthService *AntigravityOAuthService
+}
+
+func NewAntigravityTokenRefresher(antigravityOAuthService *AntigravityOAuthService) *AntigravityTokenRefresher {
+	return &AntigravityTokenRefresher{
+		antigravityOAuthService: antigravityOAuthService,
+	}
+}
+
+// CanRefresh 检查是否可以刷新此账户
+func (r *AntigravityTokenRefresher) CanRefresh(account *Account) bool {
+	return account.Platform == PlatformAntigravity && account.Type == AccountTypeOAuth
+}
+
+// NeedsRefresh 检查账户是否需要刷新
+// Antigravity 使用固定的15分钟刷新窗口，忽略全局配置
+func (r *AntigravityTokenRefresher) NeedsRefresh(account *Account, _ time.Duration) bool {
+	if !r.CanRefresh(account) {
+		return false
+	}
+	expiresAt := account.GetCredentialAsTime("expires_at")
+	if expiresAt == nil {
+		return false
+	}
+	timeUntilExpiry := time.Until(*expiresAt)
+	needsRefresh := timeUntilExpiry < antigravityRefreshWindow
+	if needsRefresh {
+		fmt.Printf("[AntigravityTokenRefresher] Account %d needs refresh: expires_at=%s, time_until_expiry=%v, window=%v\n",
+			account.ID, expiresAt.Format("2006-01-02 15:04:05"), timeUntilExpiry, antigravityRefreshWindow)
+	}
+	return needsRefresh
+}
+
+// Refresh 执行 token 刷新
+func (r *AntigravityTokenRefresher) Refresh(ctx context.Context, account *Account) (map[string]any, error) {
+	tokenInfo, err := r.antigravityOAuthService.RefreshAccountToken(ctx, account)
+	if err != nil {
+		return nil, err
+	}
+
+	newCredentials := r.antigravityOAuthService.BuildAccountCredentials(tokenInfo)
+	for k, v := range account.Credentials {
+		if _, exists := newCredentials[k]; !exists {
+			newCredentials[k] = v
+		}
+	}
+
+	return newCredentials, nil
+}