feat(games): move /wordle and /loldle to the web games and add /loldledaily

/wordle and /loldle now send the wordle and loldle BotFather games in an
unlimited mode: each player gets their own word or champion, saved after
every guess, with a New game button. Cards the bot did not record as
unlimited, including the daily cards, play the daily puzzle. The helper
commands keep working on the player's round.

/loldledaily mirrors /wordledaily: one champion per day at 07:00 ICT,
subscribe and unsubscribe, the morning recap and the live group results.

The daily and unlimited machinery is shared in util/guessgame, the old
in-chat wordle module is removed, and a one-time startup migration carries
each player's stats and unfinished round over without changing old data.

.env.example

@@ -14,8 +14,9 @@ MONGO_DATABASE=tiennm99bot
 # ============================ Operational =========================
 # Comma-separated module list. Empty = load every module, including any module
 # added later — so list them explicitly when a deployment should only gain a new
-# module deliberately.
-MODULES=util,misc,random,amlich,wordle,loldle,noitu,lol,stock,gold,coin,stats,monkeyd,sticker,alias,blacklist,weather
+# module deliberately. wordledaily serves /wordle too; the retired name wordle
+# still loads it.
+MODULES=util,misc,random,amlich,wordledaily,loldle,noitu,lol,stock,gold,coin,stats,monkeyd,sticker,alias,blacklist,weather
 # Telegram user id for owner-only commands.
 OWNER_ID=
 # Comma-separated admin Telegram user ids.
@@ -69,6 +70,13 @@ NOITU_GAME_SECRET=
 # docs/wordledaily.md. Secret.
 WORDLEDAILY_GAME_SECRET=
 
+# Optional secret (at least 32 bytes) for the loldle game: it signs game links
+# and keys the LoLdle Daily champion order. Unset = derived from
+# TELEGRAM_BOT_TOKEN. A value shorter than 32 bytes disables the web game; the
+# in-chat /loldle commands keep working. Served under
+# <GAME_BASE_URL>/games/loldle/. See docs/loldle.md. Secret.
+LOLDLE_GAME_SECRET=
+
 # ====================== Leave UNSET on self-host ==================
 # Defaults are correct for self-host:
 #   KV_PROVIDER          — auto-selects mongodb because MONGO_URL is set