删除永续下单监控与划转强平，保留关键位监控并完成回归审计。

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/instance/instance_dashboard_lib.py

@@ -237,12 +237,8 @@ def _table_exists(conn, name: str) -> bool:
 
 
 def collect_orders(conn) -> list[dict[str, Any]]:
-    if not _table_exists(conn, "order_monitors"):
-        return []
-    rows = conn.execute(
-        "SELECT * FROM order_monitors WHERE status='active' ORDER BY id DESC"
-    ).fetchall()
-    return [_format_order_item(_row_dict(r)) for r in rows]
+    del conn
+    return []
 
 
 def collect_keys(conn) -> list[dict[str, Any]]:
@@ -265,17 +261,8 @@ def collect_trends(conn) -> list[dict[str, Any]]:
 
 
 def collect_rolls(conn) -> list[dict[str, Any]]:
-    if not _table_exists(conn, "roll_groups") or not _table_exists(conn, "order_monitors"):
-        return []
-    try:
-        rows = conn.execute(
-            """SELECT g.* FROM roll_groups g
-               INNER JOIN order_monitors m ON m.id = g.order_monitor_id AND m.status='active'
-               WHERE g.status='active' ORDER BY g.id DESC"""
-        ).fetchall()
-    except Exception:
-        return []
-    return [_format_roll_item(_row_dict(r)) for r in rows]
+    del conn
+    return []
 
 
 def collect_options_items(