fix: consolidate stacked @filter.command decorators into single with alias

Three stacked @filter.command('pubg'), @filter.command('查ID'),
@filter.command('查询') decorated the same method, but
get_handler_or_create returns the same handler metadata for all
three, appending each CommandFilter to event_filters. In the
WakingCheckStage, all filters are AND'd, so the message would need
to start with all three command names simultaneously - impossible.

Fix: use @filter.command('pubg', alias={'查ID', '查询'}) which creates
a single CommandFilter that matches any of the three command names.

main.py

@@ -434,9 +434,7 @@ class PubgPlugin(Star):
             return "steam"
         return self.config.get("default_platform", "steam")
 
-    @filter.command("pubg")
-    @filter.command("查ID")
-    @filter.command("查询")
+    @filter.command("pubg", alias={"查ID", "查询"})
     async def query_stats(self, event: AstrMessageEvent):
         logger.info(f"[pubg_plugin] query_stats 被调用: message={event.message_str!r}")
         parts = event.message_str.strip().split()