perf(cache): 三层缓存框架补强

- 新增 cache-framework skill，规范 RAM→Redis→DB 读路径、失效与 pub/sub
- 上传元数据 Otter+Redis 缓存与多节点失效；Auth Source 缓存与 pub/sub
- ListSystemConfigsByKeys 补 Redis 层；上传统计单事务；登录/Token 缓存预热
- cleanup 任务补 upload meta 失效钩子

internal/apps/upload/filesrv/file_server_test.go

@@ -34,6 +34,10 @@ import (
 	"gorm.io/gorm"
 )
 
+func init() {
+	testhelper.RegisterCleanup(cache.ResetUploadMetaCacheForTest)
+}
+
 func TestServeFileByIDAccessControl(t *testing.T) {
 	dbConn, _, cleanup := testhelper.SetupTestEnvironment(t)
 	defer cleanup()