polish(economy): surface bank/lootbox/achievement stats in /stats and /adminview

- /stats and /profile stats now show lootboxes opened and achievements unlocked
  alongside the best streak.
- /adminview shows bank balance, achievements count, lootboxes opened, and any
  pending (escrowed) wager.

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

strings/economy.py

@@ -341,7 +341,7 @@ STATS_UI: dict[str, str] = {
     "social_field":    "🤝 Sotsiaalne",
     "social_val":      "Kingitud: {given}\nSaadud: {received}",
     "records_field":   "🔥 Rekordid",
-    "records_val":     "Pikim päevane streak: **{streak}** päeva",
+    "records_val":     "Pikim päevane streak: **{streak}** päeva\n🎁 Õnnekaste avatud: **{lootboxes}**\n🏅 Saavutusi: **{achievements}/{ach_total}**",
 }
 
 # ---------------------------------------------------------------------------