Stage 17 #4: enrich the out-of-app your-turn push + add game-over

The Telegram 'your turn' notification now names the opponent and recaps their last
move (voiced as the opponent: «{name}: my move — «WORD». Score 120:95» for a scoring
play; a short 'swapped / passed, your turn' otherwise), and a new game-over
notification reports the result + final score when a game ends by any path (closing
play, all-pass, resign, timeout). Scores are recipient-first (the reader's score
leads), 2-4 players (120:95:80).

- schema: YourTurnEvent gains opponent_name/last_action/last_word/score_line
  (appended, backward-compatible); new GameOverEvent{result, score_line}. Go + UI
  bindings regenerated (flatc 23.5.26 + pnpm codegen).
- backend: notify.YourTurn enriched + notify.GameOver; emitMove resolves the mover's
  name and emits per-recipient (your_turn to the next mover, game_over to every seat),
  with recipient-first score lines built in one place.
- gateway: game_over joins the out-of-app whitelist (routing.go).
- connector: render builds the enriched your_turn + game_over text per language (en/ru).
- tests: notify round-trip (enriched + game_over), emit (enriched fields + game_over to
  all seats / per-seat result), connector render (en/ru), routing; integration replay
  (play → your_turn with real name; resign → game_over) green.
- docs: ARCHITECTURE push catalog + out-of-app set, FUNCTIONAL (+ _ru), PLAN tracker.

backend/internal/notify/notify_test.go

@@ -61,7 +61,7 @@ func TestNopPublisherDiscards(t *testing.T) {
 
 func TestYourTurnPayloadRoundTrips(t *testing.T) {
 	uid, gid := uuid.New(), uuid.New()
-	in := notify.YourTurn(uid, gid, time.Unix(1717000000, 0))
+	in := notify.YourTurn(uid, gid, time.Unix(1717000000, 0), "Ann", "play", "STOOL", "120:95")
 	if in.UserID != uid || in.Kind != notify.KindYourTurn || in.EventID == "" {
 		t.Fatalf("intent metadata wrong: %+v", in)
 	}
@@ -72,6 +72,23 @@ func TestYourTurnPayloadRoundTrips(t *testing.T) {
 	if got := ev.DeadlineUnix(); got != 1717000000 {
 		t.Fatalf("deadline = %d, want 1717000000", got)
 	}
+	if string(ev.OpponentName()) != "Ann" || string(ev.LastAction()) != "play" ||
+		string(ev.LastWord()) != "STOOL" || string(ev.ScoreLine()) != "120:95" {
+		t.Fatalf("enriched fields wrong: name=%q action=%q word=%q score=%q",
+			ev.OpponentName(), ev.LastAction(), ev.LastWord(), ev.ScoreLine())
+	}
+}
+
+func TestGameOverPayloadRoundTrips(t *testing.T) {
+	uid, gid := uuid.New(), uuid.New()
+	in := notify.GameOver(uid, gid, "won", "120:95:80")
+	if in.UserID != uid || in.Kind != notify.KindGameOver || in.EventID == "" {
+		t.Fatalf("intent metadata wrong: %+v", in)
+	}
+	ev := fb.GetRootAsGameOverEvent(in.Payload, 0)
+	if string(ev.GameId()) != gid.String() || string(ev.Result()) != "won" || string(ev.ScoreLine()) != "120:95:80" {
+		t.Fatalf("game_over fields wrong: game=%q result=%q score=%q", ev.GameId(), ev.Result(), ev.ScoreLine())
+	}
 }
 
 func TestOpponentMovedPayloadRoundTrips(t *testing.T) {