修复实验成绩管理：

管理列表改为服务端分页，支持 10/20/50 条切换。
增加学期、成绩状态、开课学院以及项目/课程/教学班/教师关键词筛选。
数据范围分级：校级管理员可查看全校，院级管理员仅限本学院，教师仅限本人任课项目。
修复任课教师提交审核时报“无权限”：工作流查询现在会加载任课教师关系。
增加权限、学院隔离、分页和筛选回归测试。

src/Jiaowu.Api/Controllers/ExperimentGradesController.cs

@@ -38,8 +38,15 @@ public sealed class ExperimentGradesController(
     public async Task<ActionResult> GetManagement(
         Guid? academicTermId,
         ExperimentGradeSheetStatus? status,
-        CancellationToken cancellationToken)
+        Guid? collegeId = null,
+        string? keyword = null,
+        int page = 1,
+        int pageSize = 20,
+        CancellationToken cancellationToken = default)
     {
+        page = Math.Max(1, page);
+        pageSize = Math.Clamp(pageSize, 10, 50);
+        keyword = Normalize(keyword);
         var source = ScopedProjects().AsNoTracking()
             .Where(x =>
                 x.Status == ExperimentProjectStatus.Published ||
@@ -51,11 +58,28 @@ public sealed class ExperimentGradesController(
             source = source.Where(x =>
                 x.GradeSheet != null &&
                 x.GradeSheet.Status == status.Value);
+        if (collegeId.HasValue)
+            source = source.Where(x =>
+                x.TeachingTask!.Course!.CollegeId == collegeId.Value);
+        if (keyword is not null)
+            source = source.Where(x =>
+                x.Code.Contains(keyword) ||
+                x.Name.Contains(keyword) ||
+                x.TeachingTask!.TaskNumber.Contains(keyword) ||
+                x.TeachingTask.Name.Contains(keyword) ||
+                x.TeachingTask.Course!.Code.Contains(keyword) ||
+                x.TeachingTask.Course.Name.Contains(keyword) ||
+                x.TeachingTask.Teachers.Any(item =>
+                    item.Teacher!.TeacherNumber.Contains(keyword) ||
+                    item.Teacher.Name.Contains(keyword)));
 
-        return Ok(await source
+        var total = await source.CountAsync(cancellationToken);
+        var items = await source
             .OrderByDescending(x => x.TeachingTask!.AcademicTerm!.StartDate)
             .ThenBy(x => x.TeachingTask!.TaskNumber)
             .ThenBy(x => x.Code)
+            .Skip((page - 1) * pageSize)
+            .Take(pageSize)
             .Select(x => new
             {
                 x.Id,
@@ -96,7 +120,14 @@ public sealed class ExperimentGradesController(
                         x.GradeSheet.PublishedAt
                     }
             })
-            .ToListAsync(cancellationToken));
+            .ToListAsync(cancellationToken);
+        return Ok(new
+        {
+            Items = items,
+            Total = total,
+            Page = page,
+            PageSize = pageSize
+        });
     }
 
     [HttpGet("mine")]
@@ -747,6 +778,10 @@ public sealed class ExperimentGradesController(
             .Include(x => x.ExperimentProject)
             .ThenInclude(x => x!.TeachingTask)
             .ThenInclude(x => x!.Course)
+            .Include(x => x.ExperimentProject)
+            .ThenInclude(x => x!.TeachingTask)
+            .ThenInclude(x => x!.Teachers)
+            .ThenInclude(x => x.Teacher)
             .FirstOrDefaultAsync(x => x.Id == id, cancellationToken);
     }