给统计缓存加版本并绑定现有基础数据/课表失效标签，同时让演示数据、人员数据写入主动清理统计缓存；不改统计口径、筛选、导出或页面结构。

tests/Jiaowu.Api.Tests/DemoDataSeederTests.cs

@@ -1,4 +1,5 @@
 using Jiaowu.Api.Domain.Academic;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Microsoft.Data.Sqlite;
 using Microsoft.EntityFrameworkCore;
@@ -18,6 +19,7 @@ public sealed class DemoDataSeederTests
 
         var seeder = new DemoDataSeeder(
             db,
+            NoOpAppCache.Instance,
             NullLogger<DemoDataSeeder>.Instance);
 
         await seeder.SeedAsync();
@@ -46,6 +48,7 @@ public sealed class DemoDataSeederTests
 
         var seeder = new DemoDataSeeder(
             db,
+            NoOpAppCache.Instance,
             NullLogger<DemoDataSeeder>.Instance);
 
         var exception = await Assert.ThrowsAsync<InvalidOperationException>(
@@ -70,6 +73,7 @@ public sealed class DemoDataSeederTests
 
         var seeder = new DemoDataSeeder(
             db,
+            NoOpAppCache.Instance,
             NullLogger<DemoDataSeeder>.Instance);
 
         await Assert.ThrowsAsync<KeyNotFoundException>(() => seeder.SeedAsync());