docs: 完善身份模块文档注释与字段说明

src/Core/TakeoutSaaS.Shared.Web/Middleware/RequestLoggingMiddleware.cs

@@ -10,8 +10,13 @@ namespace TakeoutSaaS.Shared.Web.Middleware;
 /// </summary>
 public sealed class RequestLoggingMiddleware(RequestDelegate next, ILogger<RequestLoggingMiddleware> logger)
 {
+    /// <summary>
+    /// 记录请求日志并调用后续中间件。
+    /// </summary>
+    /// <param name="context">HTTP 上下文。</param>
     public async Task InvokeAsync(HttpContext context)
     {
+        // 1. 启动计时
         var stopwatch = Stopwatch.StartNew();
         try
         {
@@ -19,6 +24,7 @@ public sealed class RequestLoggingMiddleware(RequestDelegate next, ILogger<Reque
         }
         finally
         {
+            // 2. 结束计时并输出日志
             stopwatch.Stop();
             var traceId = TraceContext.TraceId ?? context.TraceIdentifier;
             var spanId = TraceContext.SpanId ?? Activity.Current?.SpanId.ToString() ?? string.Empty;