feat: add telegram notification channel with outbox service and per-user preferences

Extend the notification system with a third channel (telegram) alongside existing in_app and push channels. Add `telegram_enabled` column to `notification_preferences` table, update `NOTIFICATION_CHANNELS` and `_NOTIFICATION_CHANNEL_COLUMNS` mappings, and set telegram default to off (`_NOTIFICATION_CHANNEL_DEFAULTS`). Create `telegram_outbox` table with columns for uid, user_uid, chat_id, text, status, attempts, created_at, and sent_at, plus an index on status/id for efficient polling. Register `TelegramOutboxService` in the service manager lifecycle. Update API documentation strings to describe the new channel and its pairing requirement. Extend admin notification defaults view to include telegram column. Pass `notif_telegram_paired` flag to profile template based on `telegram_store.is_paired()` check. Update `NotificationPrefForm` and `NotificationDefaultForm` model literals to accept "telegram" as a valid channel value.

tests/unit/services/game/store.py

@@ -526,7 +526,7 @@ def test_serialize_handles_legacy_row_without_new_columns(local_db):
 # --- leaderboard -------------------------------------------------------------
 
 
-def test_leaderboard_orders_by_level_then_xp(local_db):
+def test_leaderboard_orders_by_score(local_db):
     high = _reset("unit_lb_high")
     low = _reset("unit_lb_low")
     _set(high, level=8, xp=economy.xp_threshold(8))
@@ -535,3 +535,23 @@ def test_leaderboard_orders_by_level_then_xp(local_db):
     names = [entry["username"] for entry in board]
     assert "unit_lb_high" in names and "unit_lb_low" in names
     assert names.index("unit_lb_high") < names.index("unit_lb_low")
+
+
+def test_leaderboard_prestige_lifts_above_lower_level(local_db):
+    refactorer = _reset("unit_lb_refactor")
+    grinder = _reset("unit_lb_grind")
+    _set(refactorer, level=1, xp=200, prestige=1)
+    _set(grinder, level=5, xp=economy.xp_threshold(5))
+    board = store.leaderboard(50)
+    names = [entry["username"] for entry in board]
+    assert names.index("unit_lb_refactor") < names.index("unit_lb_grind")
+
+
+def test_leaderboard_entry_exposes_score_and_prestige(local_db):
+    user = _reset("unit_lb_fields")
+    _set(user, prestige=3, total_harvests=12, ci_tier=2)
+    entry = next(e for e in store.leaderboard(50) if e["username"] == "unit_lb_fields")
+    farm = store.get_farm(user["uid"])
+    assert entry["prestige"] == 3
+    assert entry["score"] == economy.farm_score(farm)
+    assert {"rank", "username", "level", "xp", "coins", "total_harvests", "prestige", "score"} <= set(entry)