With DOT, EUCLID or MANHATTAN the backend returns Qdrant's raw scores,
not similarity-like values. Router, face and voice stores compare
against cosine thresholds, so log a warning at load when another
metric is configured, and document the behaviour on the stores page.
Assisted-by: Claude Code:claude-sonnet-5-5
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>