Release 2026.08.02-1

SQLite replaces Postgres, and two fixes from using the thing.

- The database is a file under ./storage instead of a second container. Ten
  members never needed a database server, and the driver is pure Go, so the
  build stays CGO_ENABLED=0 and the dependency count is unchanged. One bind
  mount is now the whole backup: no pgdata, no healthcheck-gated depends_on,
  no startup retry loop. Timestamps are UTC text, idle_ttl is seconds, the
  divisive/unified boards carry their own stddev, and foreign keys are on by
  pragma. Tests get a database file each and run without any setup
- Invites are copied, not clicked. An invite is something to send, and the
  anchor opened the join form in the admin's own browser
- Feedback asks for more than faults: the footer reads "Ongelmia? Ideoita?
  Palautetta?" and the page behind it invites ideas rather than only bugs
- Kuuntele YouTubessa opens in a new tab, so a half-typed review survives it

stats_test.go

@@ -51,7 +51,7 @@ func TestLeaderboardThresholdAndOrder(t *testing.T) {
 	}
 
 	// Identical scores everywhere means stddev 0, so unified beats divisive on the same data.
-	unified, err := a.songLeaderboard(ctx, "stddev_pop(r.score)", "asc")
+	unified, err := a.songLeaderboard(ctx, stddevPop, "asc")
 	if err != nil {
 		t.Fatal(err)
 	}