feat(wordledaily): add the daily Wordle HTML5 game

/wordledaily sends a BotFather game card whose page plays one shared word
per day, changing at 07:00 ICT. The server checks guesses, saves each
player's board after every guess and keeps NYT-style stats. A win is
reported with setGameScore, and in a group one live results message shows
everyone's colour grids.

/wordledaily_subscribe and /wordledaily_unsubscribe opt a chat or topic in
to the 07:00 push: yesterday's recap, opening with the answer and the
group's win streak, then today's card.

The HTML5 game plumbing that noitu used is now shared in util/htmlgame, and
the wordle word list and scoring live in wordle/wordlist.

cmd/server/command_menu_test.go

@@ -107,6 +107,10 @@ func TestCommandDiscovery_AllPublicCommandsHaveSafeMetadata(t *testing.T) {
 		"tth":                  "[target...]",
 		"wheelofnames":         "<option,...>",
 		"wordle":               "[word]",
+
+		"wordledaily":             "",
+		"wordledaily_subscribe":   "",
+		"wordledaily_unsubscribe": "",
 	}
 
 	menu := botCommandMenu(reg)