voice/seeds: track seed files, add russian time parser, guard replySystem

five fixes spotted during routing investigation:

- gitignore: replace blanket models/ ignore with per-dir exceptions
  (/models/embedder/, /models/stt/, /models/tts/) so the seed text
  files under models/seeds/ are tracked in version control
- query.txt: fix merged line — 'сколько стоит свет в этом месяце' and
  'найди заметку про сервер' were fused with no separator
- reminder.txt: add 11 pure-verb reminder seeds without time expressions
  to shift centroid toward the reminding intent rather than time-lexicon
- StubDateTimeParser: add Russian 'через <N> <unit>'/'через час'/'через
  полчаса', 'сегодня'/'завтра'/'послезавтра' with optional clock, and
  'в <clock>' scan. Add Russian word numbers (один-десять) and unit
  inflections (час/часа/часов, минута/минуты/минут, день/дня/дней,
  неделя/недели/недель). Also adds missing English day/week units.
- replySystem: guard time branch against duration queries ('сколько
  времени прошло') reaching it via the classifier path after the
  stage-0 grammar's build filter rejects them. Mirrors stage0.go
  duration keywords.

.gitignore

@@ -13,8 +13,11 @@ certs/
 # Dependencies (fetch/build, not vendored)
 deps/
 
-# ML models (large, downloaded separately)
-models/
+# ML models (large, downloaded separately) — specific dirs, not blanket,
+# because models/seeds/*.txt are small, tracked files the classifier needs.
+/models/embedder/
+/models/stt/
+/models/tts/
 
 # Runtime data
 *.db