fix: clean up .rdb index files in Go volume operations

Add .rdb (redb index) cleanup to removeVolumeFiles and vacuum commit
in Go code, for compatibility with mixed Rust/Go volume server
deployments. Route .rdb through dirIdx in FileName() like .idx/.ldb.

weed/storage/volume.go

@@ -94,7 +94,7 @@ func (v *Volume) IndexFileName() (fileName string) {
 
 func (v *Volume) FileName(ext string) (fileName string) {
 	switch ext {
-	case ".idx", ".cpx", ".ldb", ".cpldb":
+	case ".idx", ".cpx", ".ldb", ".cpldb", ".rdb":
 		return VolumeFileName(v.dirIdx, v.Collection, int(v.Id)) + ext
 	}
 	// .dat, .cpd, .vif

weed/storage/volume_vacuum.go

@@ -199,6 +199,7 @@ func (v *Volume) CommitCompact() error {
 	//time.Sleep(20 * time.Second)
 
 	os.RemoveAll(v.FileName(".ldb"))
+	os.Remove(v.FileName(".rdb"))
 
 	glog.V(3).Infof("Loading volume %d commit file...", v.Id)
 	if e = v.load(true, false, v.needleMapKind, 0, v.Version()); e != nil {

weed/storage/volume_write.go

@@ -99,6 +99,8 @@ func removeVolumeFiles(filename string) {
 	os.Remove(filename + ".cpx")
 	// level db index file
 	os.RemoveAll(filename + ".ldb")
+	// redb index file (Rust volume server)
+	os.Remove(filename + ".rdb")
 	// marker for damaged or incomplete volume
 	os.Remove(filename + ".note")
 }