branch-4.1: [opt](memory) Remove unused dbId field from CloudReplica #62079 (#62105)

Cherry-picked from #62079

Co-authored-by: Yongqiang YANG <yangyongqiang@selectdb.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: 3 people

fe/fe-core/src/main/java/org/apache/doris/cloud/catalog/CloudReplica.java

@@ -59,8 +59,6 @@ public class CloudReplica extends Replica implements GsonPostProcessable {
     private ConcurrentHashMap<String, List<Long>> primaryClusterToBackends = null;
     @SerializedName(value = "be")
     private ConcurrentHashMap<String, Long> primaryClusterToBackend = new ConcurrentHashMap<>();
-    @SerializedName(value = "dbId")
-    private long dbId = -1;
     @SerializedName(value = "tableId")
     private long tableId = -1;
     @SerializedName(value = "partitionId")
@@ -105,7 +103,6 @@ public CloudReplica(ReplicaContext context) {
     public CloudReplica(long replicaId, Long backendId, ReplicaState state, long version, int schemaHash,
             long dbId, long tableId, long partitionId, long indexId, long idx) {
         super(replicaId, -1, state, version, schemaHash);
-        this.dbId = dbId;
         this.tableId = tableId;
         this.partitionId = partitionId;
         this.indexId = indexId;
@@ -529,10 +526,6 @@ public boolean checkVersionCatchUp(long expectedVersion, boolean ignoreAlter) {
         return true;
     }
 
-    public long getDbId() {
-        return dbId;
-    }
-
     public long getTableId() {
         return tableId;
     }