The gRPC server wrapper in pkg/grpc/server.go reconstructs
TranscriptSegment messages when relaying AudioTranscription results
from backends. The Words field was not being copied, causing all
word-level timestamps to be silently dropped regardless of backend
support.
This was introduced when PR #9621 added the TranscriptWord proto
message and transcriptResultFromProto (server-side), but did not
update the server-side gRPC relay to forward the new field.
Fixes#9306
Signed-off-by: fqscfqj <fqscfqj@outlook.com>