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

core/economy/leaderboards.py

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 from .. import pb_client
+from . import house
 from .levels import get_level
 
 
@@ -109,3 +110,30 @@ async def get_all_leaderboards() -> dict[str, list[tuple]]:
         "fish":     [(r["user_id"], r.get("total_fish_caught", 0))
                      for r in desc(lambda r: r.get("total_fish_caught", 0))],
     }
+
+
+async def get_economy_stats() -> dict[str, int]:
+    """Money-supply snapshot from a single scan: total coins in circulation, how
+    much players hold vs. the house. Lets /status show whether the sinks (house,
+    vanity burn, bail, fines) are keeping pace with minted income."""
+    records = await pb_client.list_all_records()
+    house_id = str(house.HOUSE_ID) if house.HOUSE_ID is not None else None
+    total = 0
+    house_balance = 0
+    player_count = 0
+    for r in records:
+        uid = r.get("user_id")
+        if not uid:
+            continue
+        bal = r.get("balance", 0) or 0
+        total += bal
+        if uid == house_id:
+            house_balance = bal
+        else:
+            player_count += 1
+    return {
+        "total_coins": total,
+        "house_balance": house_balance,
+        "player_coins": total - house_balance,
+        "player_count": player_count,
+    }