perf(plugin): use asyncio.gather for concurrent page discovery

Replace sequential await loop with concurrent processing to avoid
blocking on disk I/O when discovering plugin pages.

Author: lxfight

astrbot/dashboard/routes/plugin.py

@@ -1262,13 +1262,23 @@ def _get_plugin_installed_at(self, plugin) -> str | None:
     async def get_plugins(self):
         _plugin_resp = []
         plugin_name = request.args.get("name")
-        for plugin in self.plugin_manager.context.get_all_stars():
-            if plugin_name and plugin.name != plugin_name:
-                continue
+
+        plugins = [
+            p
+            for p in self.plugin_manager.context.get_all_stars()
+            if not (plugin_name and p.name != plugin_name)
+        ]
+
+        async def process_plugin(plugin):
             logo_url = None
             if plugin.logo_path:
                 logo_url = await self.get_plugin_logo_token(plugin.logo_path)
             pages = await self._discover_plugin_pages(plugin)
+            return plugin, logo_url, pages
+
+        results = await asyncio.gather(*(process_plugin(p) for p in plugins))
+
+        for plugin, logo_url, pages in results:
             _t = {
                 "name": plugin.name,
                 "repo": "" if plugin.repo is None else plugin.repo,
@@ -1298,6 +1308,7 @@ async def get_plugins(self):
             ):
                 continue
             _plugin_resp.append(_t)
+            _plugin_resp.append(_t)
         return (
             Response()
             .ok(_plugin_resp, message=self.plugin_manager.failed_plugin_info)