Add auto break-even toggle and WeCom hub notifications.

Desktop can auto-pull stop to open+/-1 after a 3$ favorable move; hub pushes open/close events and a 23:00 BJT daily summary via webhook.

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

desktop/device_store.py

@@ -43,9 +43,20 @@ def load_device() -> dict[str, Any]:
     data.setdefault("machine_name", platform.node() or "PC")
     data.setdefault("server", "")
     data.setdefault("token", "")
+    data.setdefault("auto_break_even", False)
     return data
 
 
+def get_auto_break_even() -> bool:
+    return bool(load_device().get("auto_break_even"))
+
+
+def set_auto_break_even(enabled: bool) -> None:
+    d = load_device()
+    d["auto_break_even"] = bool(enabled)
+    save_device(d)
+
+
 def save_device(data: dict[str, Any]) -> None:
     ensure_dir()
     DEVICE_FILE.write_text(json.dumps(data, ensure_ascii=False, indent=2), encoding="utf-8")