admin: include EC volumes in bucket size reporting (#9058)

* admin: include EC volumes in bucket size reporting

The Object Store buckets page computed per-collection size by iterating
only regular volumes, so once a bucket's data was EC-encoded it silently
disappeared from the reported size — breaking usage-based billing.

Walk EcShardInfos alongside VolumeInfos in collectCollectionStats: add
raw shard bytes to PhysicalSize, and the parity-stripped value
(shardBytes * DataShardsCount / TotalShardsCount) to LogicalSize,
matching the normalization used by `weed shell` cluster.status.

* admin: derive EC logical size from shard bitmap, not constants

Use ShardsInfoFromVolumeEcShardInformationMessage + MinusParityShards
to sum actual data-shard bytes instead of scaling raw bytes by the
DataShardsCount/TotalShardsCount ratio. Keeps the data/parity split
encapsulated in the erasure_coding package and is exact when shard
sizes differ (e.g. last shard).

* admin: regression test for EC shard size aggregation

Cover the uneven-tail-shard case (data shard 9 < 1000 bytes) and the
empty-collection-name path to pin PhysicalSize/LogicalSize behavior
for collectCollectionStats against future changes.

weed/admin/dash/admin_server.go

@@ -23,6 +23,7 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/pb/plugin_pb"
 	"github.com/seaweedfs/seaweedfs/weed/pb/schema_pb"
 	"github.com/seaweedfs/seaweedfs/weed/security"
+	"github.com/seaweedfs/seaweedfs/weed/storage/erasure_coding"
 	"github.com/seaweedfs/seaweedfs/weed/storage/super_block"
 	"github.com/seaweedfs/seaweedfs/weed/util"
 	"github.com/seaweedfs/seaweedfs/weed/wdclient"
@@ -1698,6 +1699,17 @@ func collectCollectionStats(topologyInfo *master_pb.TopologyInfo) map[string]col
 						}
 						collectionMap[collection] = data
 					}
+					for _, ecShardInfo := range diskInfo.EcShardInfos {
+						collection := ecShardInfo.Collection
+						if collection == "" {
+							collection = "default"
+						}
+						shards := erasure_coding.ShardsInfoFromVolumeEcShardInformationMessage(ecShardInfo)
+						data := collectionMap[collection]
+						data.PhysicalSize += int64(shards.TotalSize())
+						data.LogicalSize += int64(shards.MinusParityShards().TotalSize())
+						collectionMap[collection] = data
+					}
 				}
 			}
 		}