点名、成绩册统一读取“行政班在籍学生 ∪ 已选课学生”，不再错误显示 0 人。

教师选课名单改为展示全部本人教学班及完整学生名单，支持 Excel 导出。
调停课改用教师专用教学班接口，并在服务端限制只能操作本人教学班。

tests/Jiaowu.Api.Tests/MySqlMigrationTests.cs

@@ -1,4 +1,5 @@
 using Jiaowu.Api.Infrastructure.Persistence;
+using Jiaowu.Api.Infrastructure.Teaching;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Infrastructure;
 using Microsoft.EntityFrameworkCore.Migrations;
@@ -98,6 +99,21 @@ public sealed class MySqlMigrationTests
         Assert.Contains(ids[1].ToString(), sql, StringComparison.OrdinalIgnoreCase);
     }
 
+    [Fact]
+    public void MySql_teaching_task_roster_query_is_translatable()
+    {
+        using var db = new AppDbContext(CreateMySqlOptions());
+
+        var sql = TeachingTaskRosterQuery
+            .ForTask(
+                db,
+                Guid.Parse("11111111-1111-1111-1111-111111111111"))
+            .ToQueryString();
+
+        Assert.Contains("TeachingTaskClasses", sql, StringComparison.OrdinalIgnoreCase);
+        Assert.Contains("CourseEnrollments", sql, StringComparison.OrdinalIgnoreCase);
+    }
+
     [Fact]
     public void MySql_index_names_fit_the_server_identifier_limit()
     {