feat(status): show money-supply metric in /status

Adds economy.get_economy_stats() (single-scan total coins, house balance,
player-held coins, player count) and a "Rahavaru" field to /status, so admins
can see whether the sinks are keeping pace with minted income. Also removed a
duplicate bot_admin_check import.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013VbAVsrZuYesea99mPMmPT

strings/common.py

@@ -243,6 +243,8 @@ STATUS_UI: dict[str, str] = {
     "tasks_field": "🔄 Async tasks",
     "eco_players_field": "👤 Eco players",
     "members_cache_field": "📋 Liikmed (cache)",
+    "supply_field": "💰 Rahavaru",
+    "supply_val": "Kokku {total}\nMängijatel {players}\nKassas {house} ({house_pct}%)",
     "log_files_field": "📂 Log files",
     "log_line": "`{name}` - {size_kb} KB",
     "none": "-",