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/deferred_service.go

@@ -1,76 +1,76 @@
-package service
-
-import (
-	"context"
-	"log"
-	"sync"
-	"time"
-)
-
-// DeferredService provides deferred batch update functionality
-type DeferredService struct {
-	accountRepo AccountRepository
-	timingWheel *TimingWheelService
-	interval    time.Duration
-
-	lastUsedUpdates sync.Map
-}
-
-// NewDeferredService creates a new DeferredService instance
-func NewDeferredService(accountRepo AccountRepository, timingWheel *TimingWheelService, interval time.Duration) *DeferredService {
-	return &DeferredService{
-		accountRepo: accountRepo,
-		timingWheel: timingWheel,
-		interval:    interval,
-	}
-}
-
-// Start starts the deferred service
-func (s *DeferredService) Start() {
-	s.timingWheel.ScheduleRecurring("deferred:last_used", s.interval, s.flushLastUsed)
-	log.Printf("[DeferredService] Started (interval: %v)", s.interval)
-}
-
-// Stop stops the deferred service
-func (s *DeferredService) Stop() {
-	s.timingWheel.Cancel("deferred:last_used")
-	s.flushLastUsed()
-	log.Printf("[DeferredService] Service stopped")
-}
-
-func (s *DeferredService) ScheduleLastUsedUpdate(accountID int64) {
-	s.lastUsedUpdates.Store(accountID, time.Now())
-}
-
-func (s *DeferredService) flushLastUsed() {
-	updates := make(map[int64]time.Time)
-	s.lastUsedUpdates.Range(func(key, value any) bool {
-		id, ok := key.(int64)
-		if !ok {
-			return true
-		}
-		ts, ok := value.(time.Time)
-		if !ok {
-			return true
-		}
-		updates[id] = ts
-		s.lastUsedUpdates.Delete(key)
-		return true
-	})
-
-	if len(updates) == 0 {
-		return
-	}
-
-	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
-	defer cancel()
-
-	if err := s.accountRepo.BatchUpdateLastUsed(ctx, updates); err != nil {
-		log.Printf("[DeferredService] BatchUpdateLastUsed failed (%d accounts): %v", len(updates), err)
-		for id, ts := range updates {
-			s.lastUsedUpdates.Store(id, ts)
-		}
-	} else {
-		log.Printf("[DeferredService] BatchUpdateLastUsed flushed %d accounts", len(updates))
-	}
-}
+package service
+
+import (
+	"context"
+	"log"
+	"sync"
+	"time"
+)
+
+// DeferredService provides deferred batch update functionality
+type DeferredService struct {
+	accountRepo AccountRepository
+	timingWheel *TimingWheelService
+	interval    time.Duration
+
+	lastUsedUpdates sync.Map
+}
+
+// NewDeferredService creates a new DeferredService instance
+func NewDeferredService(accountRepo AccountRepository, timingWheel *TimingWheelService, interval time.Duration) *DeferredService {
+	return &DeferredService{
+		accountRepo: accountRepo,
+		timingWheel: timingWheel,
+		interval:    interval,
+	}
+}
+
+// Start starts the deferred service
+func (s *DeferredService) Start() {
+	s.timingWheel.ScheduleRecurring("deferred:last_used", s.interval, s.flushLastUsed)
+	log.Printf("[DeferredService] Started (interval: %v)", s.interval)
+}
+
+// Stop stops the deferred service
+func (s *DeferredService) Stop() {
+	s.timingWheel.Cancel("deferred:last_used")
+	s.flushLastUsed()
+	log.Printf("[DeferredService] Service stopped")
+}
+
+func (s *DeferredService) ScheduleLastUsedUpdate(accountID int64) {
+	s.lastUsedUpdates.Store(accountID, time.Now())
+}
+
+func (s *DeferredService) flushLastUsed() {
+	updates := make(map[int64]time.Time)
+	s.lastUsedUpdates.Range(func(key, value any) bool {
+		id, ok := key.(int64)
+		if !ok {
+			return true
+		}
+		ts, ok := value.(time.Time)
+		if !ok {
+			return true
+		}
+		updates[id] = ts
+		s.lastUsedUpdates.Delete(key)
+		return true
+	})
+
+	if len(updates) == 0 {
+		return
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	if err := s.accountRepo.BatchUpdateLastUsed(ctx, updates); err != nil {
+		log.Printf("[DeferredService] BatchUpdateLastUsed failed (%d accounts): %v", len(updates), err)
+		for id, ts := range updates {
+			s.lastUsedUpdates.Store(id, ts)
+		}
+	} else {
+		log.Printf("[DeferredService] BatchUpdateLastUsed flushed %d accounts", len(updates))
+	}
+}