fix(cmd): serve now actually sets the upload chat budget and model

cmdServe assigned Uploads and UploadLimits but not UploadChatMaxChars, so chat
over a long recording would have used the 18,000-char caption default. It now
calls wireUploads, which is tested.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

cmd/tapir/main.go

@@ -215,9 +215,8 @@ func cmdServe(ctx context.Context, log *slog.Logger) error {
 	if err != nil {
 		return err
 	}
+	wireUploads(app, cfg, intake)
 	if intake != nil {
-		app.Uploads = intake
-		app.UploadLimits = uploadLimits(cfg)
 		go worker.Run(ctx)
 		log.Info("audio upload enabled", "model", cfg.TranscribeModel, "fallback", cfg.TranscribeFallbackModel,
 			"max_mb", cfg.UploadMaxBytes>>20, "max_minutes", int(cfg.UploadMaxDuration.Minutes()))