Add !adv alias, hospital insurance billing, wordle/UNO earnings tracking, streak death protection

- Add !adv shorthand for !adventure commands and DM replies
- Hospital bill now shows insurance deduction and amount due
- Refactor hospital nudge from per-goroutine sleep to shared ticker
- Dead players' streaks are frozen; grace period on revival day
- Track wordle earnings in wordle_stats, show in !stats and superstats
- Show UNO net earnings and trivia accuracy % in superstats
- Disable sentiment/profanity emoji reactions (classification still logs)
- Add URL_PREVIEW_IGNORE_USERS env var to skip bot users
- Add DISABLE_WOTD_POST env var, remove unused wotd.Prefetch()
- README updates for all of the above

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

internal/plugin/wordle.go

@@ -685,6 +685,11 @@ func (p *WordlePlugin) awardPrize(puzzle *WordlePuzzle) []WordlePayout {
 		}
 		p.euro.Credit(uid, float64(amount), "wordle_win")
 		payouts = append(payouts, WordlePayout{Name: c.name, Amount: amount, Solver: c.solver})
+
+		// Track earnings in wordle_stats
+		d := db.Get()
+		d.Exec(`UPDATE wordle_stats SET total_earned = total_earned + ? WHERE user_id = ?`,
+			amount, string(uid))
 	}
 	return payouts
 }