"""
应用级全局状态
event_bus、ws_manager 等由 main.py startup 设置，各 router 通过 `from app import state` 使用。
event_bus = None
ws_manager = None
def set_event_bus(eb):
global event_bus
event_bus = eb
def set_ws_manager(wm):
global ws_manager
ws_manager = wm