doc: 补全部分注释

pkg/plugin/installer.py

@@ -7,6 +7,7 @@ from ..core import app
 
 
 class PluginInstaller(metaclass=abc.ABCMeta):
+    """插件安装器抽象类"""
 
     ap: app.Application
 

pkg/plugin/installers/github.py

@@ -12,6 +12,8 @@ from ...utils import pkgmgr
 
 
 class GitHubRepoInstaller(installer.PluginInstaller):
+    """GitHub仓库插件安装器
+    """
 
     def get_github_plugin_repo_label(self, repo_url: str) -> list[str]:
         """获取username, repo"""

pkg/plugin/loader.py

@@ -9,7 +9,7 @@ from . import context, events
 
 
 class PluginLoader(metaclass=abc.ABCMeta):
-    """插件加载器"""
+    """插件加载器抽象类"""
 
     ap: app.Application
 

pkg/plugin/manager.py

@@ -10,6 +10,7 @@ from .installers import github
 
 
 class PluginManager:
+    """插件管理器"""
 
     ap: app.Application
 

pkg/plugin/setting.py

@@ -6,6 +6,7 @@ from . import context
 
 
 class SettingManager:
+    """插件设置管理器"""
 
     ap: app.Application