feat(random): group the random pickers into a random module and add /gachabeta

/random, /wheelofnames, and /gacha move from misc into a new random module
with unchanged command names, so usage stats carry over. The new unlisted
/gachabeta takes the same input as /gacha and renders the toon-shaded beta
wish from /api/gachabeta on the same service, with the same text fallback.

.env.example

@@ -15,7 +15,7 @@ MONGO_DATABASE=miti99bot
 # 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,amlich,wordle,loldle,lol,stock,gold,coin,stats,monkeyd,sticker,alias,blacklist
+MODULES=util,misc,random,amlich,wordle,loldle,lol,stock,gold,coin,stats,monkeyd,sticker,alias,blacklist
 # Telegram user id for owner-only commands (renamed from BOT_OWNER_ID).
 OWNER_ID=
 # Comma-separated admin Telegram user ids (renamed from ADMIN_USER_IDS).