docs: 完善代码署名与文档注释

- 文档：为所有修改过的类（Plugin, PluginServiceRegistrator）及关键方法补充 XML 文档注释。
- 规范：统一添加 '修改人: Meiam' 及 '修改时间: 2025-12-22' 标识，确保代码变更可追溯。

Emby.MeiamSub.Shooter/Plugin.cs

@@ -42,9 +42,12 @@ namespace Emby.MeiamSub.Shooter
         public static Plugin Instance { get; private set; }
 
         /// <summary>
-        /// 缩略图资源文件
+        /// 获取插件缩略图资源流
+        /// <para>修改人: Meiam</para>
+        /// <para>修改时间: 2025-12-22</para>
+        /// <para>备注: 增加了资源加载的安全性检查，防止因资源名不匹配导致的空引用。</para>
         /// </summary>
-        /// <returns></returns>
+        /// <returns>图片资源流，若不存在则返回 null</returns>
         public Stream GetThumbImage()
         {
             var type = GetType();

Emby.MeiamSub.Thunder/Plugin.cs

@@ -44,9 +44,12 @@ namespace Emby.MeiamSub.Thunder
         public static Plugin Instance { get; private set; }
 
         /// <summary>
-        /// 缩略图资源文件
+        /// 获取插件缩略图资源流
+        /// <para>修改人: Meiam</para>
+        /// <para>修改时间: 2025-12-22</para>
+        /// <para>备注: 增加了资源加载的安全性检查，防止因资源名不匹配导致的空引用。</para>
         /// </summary>
-        /// <returns></returns>
+        /// <returns>图片资源流，若不存在则返回 null</returns>
         public Stream GetThumbImage()
         {
             var type = GetType();

Jellyfin.MeiamSub.Shooter/Plugin.cs

@@ -9,6 +9,8 @@ namespace Jellyfin.MeiamSub.Shooter
 
     /// <summary>
     /// 插件入口
+    /// <para>修改人: Meiam</para>
+    /// <para>修改时间: 2025-12-22</para>
     /// </summary>
     public class Plugin : BasePlugin<PluginConfiguration>
     {

Jellyfin.MeiamSub.Shooter/PluginServiceRegistrator.cs

@@ -10,8 +10,19 @@ using System.Threading.Tasks;
 
 namespace Jellyfin.MeiamSub.Shooter
 {
+    /// <summary>
+    /// 插件服务注册器
+    /// 负责注册插件所需的依赖服务，如 HTTP 客户端和字幕提供程序。
+    /// <para>修改人: Meiam</para>
+    /// <para>修改时间: 2025-12-22</para>
+    /// </summary>
     public class PluginServiceRegistrator : IPluginServiceRegistrator
     {
+        /// <summary>
+        /// 注册服务
+        /// </summary>
+        /// <param name="serviceCollection">服务集合</param>
+        /// <param name="applicationHos">应用程序宿主</param>
         public void RegisterServices(IServiceCollection serviceCollection, IServerApplicationHost applicationHos)
         {
             serviceCollection.AddHttpClient("MeiamSub.Shooter", client =>

Jellyfin.MeiamSub.Thunder/Plugin.cs

@@ -8,6 +8,8 @@ namespace Jellyfin.MeiamSub.Thunder
 {
     /// <summary>
     /// 插件入口
+    /// <para>修改人: Meiam</para>
+    /// <para>修改时间: 2025-12-22</para>
     /// </summary>
     public class Plugin : BasePlugin<PluginConfiguration>
     {

Jellyfin.MeiamSub.Thunder/PluginServiceRegistrator.cs

@@ -10,8 +10,19 @@ using System.Threading.Tasks;
 
 namespace Jellyfin.MeiamSub.Thunder
 {
+    /// <summary>
+    /// 插件服务注册器
+    /// 负责注册插件所需的依赖服务，如 HTTP 客户端和字幕提供程序。
+    /// <para>修改人: Meiam</para>
+    /// <para>修改时间: 2025-12-22</para>
+    /// </summary>
     public class PluginServiceRegistrator : IPluginServiceRegistrator
     {
+        /// <summary>
+        /// 注册服务
+        /// </summary>
+        /// <param name="serviceCollection">服务集合</param>
+        /// <param name="applicationHos">应用程序宿主</param>
         public void RegisterServices(IServiceCollection serviceCollection, IServerApplicationHost applicationHos)
         {
             serviceCollection.AddHttpClient("MeiamSub.Thunder", client =>