feat: Add object count tracking and display for S3 buckets.

internal/api/admin_handler.go

@@ -44,6 +44,7 @@ type BucketResponse struct {
 	UsedSize        int64     `json:"used_size"`
 	AvailableSize   int64     `json:"available_size"`
 	UsagePercent    float64   `json:"usage_percent"`
+	ObjectCount     int64     `json:"object_count"`
 	Weight          int       `json:"weight"`
 	Enabled         bool      `json:"enabled"`
 	Available       bool      `json:"available"`
@@ -59,18 +60,18 @@ type BucketResponse struct {
 
 // BucketsListResponse 存储桶列表响应结构
 type BucketsListResponse struct {
-	Total   int                `json:"total"`
-	Buckets []BucketResponse   `json:"buckets"`
+	Total   int              `json:"total"`
+	Buckets []BucketResponse `json:"buckets"`
 }
 
 // HealthResponse 健康状态响应结构
 type HealthResponse struct {
-	Status          string    `json:"status"`
-	Timestamp       time.Time `json:"timestamp"`
-	LoadBalancer    string    `json:"load_balancer_strategy"`
-	TotalBuckets    int       `json:"total_buckets"`
-	AvailableBuckets int      `json:"available_buckets"`
-	Database        string    `json:"database_type"`
+	Status           string    `json:"status"`
+	Timestamp        time.Time `json:"timestamp"`
+	LoadBalancer     string    `json:"load_balancer_strategy"`
+	TotalBuckets     int       `json:"total_buckets"`
+	AvailableBuckets int       `json:"available_buckets"`
+	Database         string    `json:"database_type"`
 }
 
 // RegisterRoutes 注册管理API路由
@@ -205,6 +206,7 @@ func (h *AdminHandler) convertBucketInfo(b *bucket.BucketInfo) BucketResponse {
 		MaxSize:         b.Config.MaxSize,
 		MaxSizeBytes:    b.Config.MaxSizeBytes,
 		UsedSize:        b.UsedSize,
+		ObjectCount:     b.GetObjectCount(),
 		Weight:          b.Config.Weight,
 		Enabled:         b.Config.Enabled,
 		Available:       b.Available,

internal/bucket/manager.go

@@ -32,6 +32,7 @@ type BucketInfo struct {
 	Config                config.BucketConfig
 	Client                *s3.Client
 	UsedSize              int64     // 已使用容量（字节）
+	ObjectCount           int64     // 对象数量
 	Available             bool      // 是否可用（由health监控更新）
 	LastChecked           time.Time // 最后检查时间（由health监控更新）
 	mu                    sync.RWMutex
@@ -320,6 +321,13 @@ func (b *BucketInfo) GetUsedSize() int64 {
 	return b.UsedSize
 }
 
+// GetObjectCount 获取对象数量
+func (b *BucketInfo) GetObjectCount() int64 {
+	b.mu.RLock()
+	defer b.mu.RUnlock()
+	return b.ObjectCount
+}
+
 // UpdateUsedSize 更新已使用容量
 func (b *BucketInfo) UpdateUsedSize(delta int64) {
 	b.mu.Lock()

internal/bucket/reporter.go

@@ -60,6 +60,7 @@ func (r *MetricsReporter) ReportStats(stats *health.Stats) {
 	if exists {
 		bucket.mu.Lock()
 		bucket.UsedSize = stats.UsedSize
+		bucket.ObjectCount = stats.ObjectCount
 		bucket.mu.Unlock()
 
 		// 更新 Prometheus 指标