fix(plugin_store): 修复递代错误 (#1986)

- 在查找插件时使用 next() 函数的默认值 None，避免抛出 StopIteration 异常
- 增加对未找到插件的错误处理，返回相应的错误信息
- 优化了插件查找逻辑，提高了代码的健壮性和可读性

Co-authored-by: HibiKier <45528451+HibiKier@users.noreply.github.com>

zhenxun/builtin_plugins/plugin_store/data_source.py

@@ -198,7 +198,9 @@ class StoreManager:
         except ValueError as e:
             return str(e)
         db_plugin_list = await cls.get_loaded_plugins("module")
-        plugin_info = next(p for p in plugin_list if p.module == plugin_key)
+        plugin_info = next((p for p in plugin_list if p.module == plugin_key), None)
+        if plugin_info is None:
+            return f"未找到插件 {plugin_key}"
         if plugin_info.module in [p[0] for p in db_plugin_list]:
             return f"插件 {plugin_info.name} 已安装，无需重复安装"
         is_external = True
@@ -307,7 +309,9 @@ class StoreManager:
             plugin_key = await cls._resolve_plugin_key(plugin_id)
         except ValueError as e:
             return str(e)
-        plugin_info = next(p for p in plugin_list if p.module == plugin_key)
+        plugin_info = next((p for p in plugin_list if p.module == plugin_key), None)
+        if plugin_info is None:
+            return f"未找到插件 {plugin_key}"
         path = BASE_PATH
         if plugin_info.github_url:
             path = BASE_PATH / "plugins"
@@ -383,7 +387,9 @@ class StoreManager:
             plugin_key = await cls._resolve_plugin_key(plugin_id)
         except ValueError as e:
             return str(e)
-        plugin_info = next(p for p in plugin_list if p.module == plugin_key)
+        plugin_info = next((p for p in plugin_list if p.module == plugin_key), None)
+        if plugin_info is None:
+            return f"未找到插件 {plugin_key}"
         logger.info(f"尝试更新插件 {plugin_info.name}", LOG_COMMAND)
         db_plugin_list = await cls.get_loaded_plugins("module", "version")
         suc_plugin = {p[0]: (p[1] or "Unknown") for p in db_plugin_list}