feat(access-logs): 重构访问日志为概览与明细双 Tab

新增访问日志概览 API 与前端页面：汇总请求量/访问量/带宽趋势与 Top 排行，
明细列表保留检索；排行榜改为紧凑列表样式。

pkg/geoip/country_centroid_test.go

@@ -14,12 +14,12 @@ func TestCountryCentroidGermany(t *testing.T) {
 
 func TestCountryCentroidHongKongSingaporeTaiwan(t *testing.T) {
 	cases := []struct {
-		iso      string
-		name     string
-		minLat   float64
-		maxLat   float64
-		minLon   float64
-		maxLon   float64
+		iso    string
+		name   string
+		minLat float64
+		maxLat float64
+		minLon float64
+		maxLon float64
 	}{
 		{iso: "HK", name: "Hong Kong", minLat: 22, maxLat: 23, minLon: 113, maxLon: 115},
 		{iso: "SG", name: "Singapore", minLat: 1, maxLat: 2, minLon: 103, maxLon: 104},

pkg/protocol/agent.go

@@ -128,8 +128,8 @@ type NodeMetricSnapshot struct {
 	MemoryTotalBytes  int64   `json:"memory_total_bytes"`
 	StorageUsedBytes  int64   `json:"storage_used_bytes"`
 	StorageTotalBytes int64   `json:"storage_total_bytes"`
-	DiskReadBytes  int64 `json:"disk_read_bytes"`
-	DiskWriteBytes int64 `json:"disk_write_bytes"`
+	DiskReadBytes     int64   `json:"disk_read_bytes"`
+	DiskWriteBytes    int64   `json:"disk_write_bytes"`
 }
 
 // NodeAccessLog is an access log entry from agent (L1 business fact).