docs(telegram): invert chat-gate strategy in docs; tune logs; i18n text

- Bake the final default-allow + mute-the-ineligible strategy into
  docs/ARCHITECTURE.md, docs/FUNCTIONAL.md (+_ru), platform/telegram/README.md,
  the deploy compose comment and the PRERELEASE tracker. The live test proved a
  per-user grant cannot exceed a deny-by-default group (Telegram intersects the
  chat default with the per-user permission), so the chat allows sending by
  default and the bot restricts the ineligible instead of granting the eligible.
- Lower the per-event chat_member trace and eligibility evaluation to Debug;
  keep the actual mute/unmute actions, the startup self-check and warnings at
  Info, so prod logs only what the bot did.
- Update game.searchingForOpponent (Searching -> Waiting for opponent / Поиск ->
  Ждём соперника) and the quickmatch e2e assertions to match.

docs/FUNCTIONAL.md

@@ -323,13 +323,13 @@ plus the reason when one was given, and the app stops all background traffic wit
 temporary block lifts itself when it expires; the operator can also **unblock** from the user card
 at any time (games already lost stay lost).
 
-Where the bot manages a channel's **linked discussion chat**, only a **registered** player who is
-**not blocked** may write there: the bot grants the right to write when such a player joins, while an
-unregistered or blocked one stays muted (the promo bot points newcomers at the game so they register).
-An operator can also **mute a player in the chat only** — a `chat_muted` role on the user card —
-without a full account block; an account block mutes them in the chat regardless. Muting/unmuting and
-blocking/unblocking take effect for a player already in the chat; one who is not in it is unaffected
-until they next join.
+Where the bot manages a channel's **linked discussion chat**, everyone may write by default and the
+bot **mutes** a player who is **not registered** or is **blocked**, un-muting them once they register
+or are unblocked. So an unregistered newcomer who comments is muted (the promo bot points them at the
+game to register, after which the bot restores their voice), and a registered, unblocked player simply
+writes. An operator can also **mute a player in the chat only** — a `chat_muted` role on the user card —
+without a full account block; an account block mutes them in the chat regardless. Muting and unmuting
+take effect for a player already in the chat; one who is not in it is unaffected until they next join.
 
 From the user card the operator can also **top up a player's hint wallet**: an additive grant
 (1–100 hints per action) that raises the balance shown on the card. Grants are **raise-only** —