feat(update-center): 实现集中式软件更新中心功能

新增更新中心模块，支持管理 APM 和传统 deb 软件更新任务
- 添加更新任务队列管理、状态跟踪和日志记录功能
- 实现更新项忽略配置持久化存储
- 新增更新确认对话框和迁移提示
- 优化主窗口关闭时的任务保护机制
- 添加单元测试覆盖核心逻辑

src/__tests__/unit/update-center/main-window-close-guard.test.ts

@@ -0,0 +1,44 @@
+import { describe, expect, it } from "vitest";
+
+import {
+  getMainWindowCloseAction,
+  shouldPreventMainWindowClose,
+} from "../../../../electron/main/window-close-guard";
+
+describe("main window close guard", () => {
+  it("keeps the app alive while update-center work is running", () => {
+    expect(
+      shouldPreventMainWindowClose({
+        installTaskCount: 0,
+        hasRunningUpdateCenterTasks: true,
+      }),
+    ).toBe(true);
+  });
+
+  it("allows close only when both install and update-center work are idle", () => {
+    expect(
+      shouldPreventMainWindowClose({
+        installTaskCount: 0,
+        hasRunningUpdateCenterTasks: false,
+      }),
+    ).toBe(false);
+  });
+
+  it("returns a hide action while any guarded work is active", () => {
+    expect(
+      getMainWindowCloseAction({
+        installTaskCount: 1,
+        hasRunningUpdateCenterTasks: false,
+      }),
+    ).toBe("hide");
+  });
+
+  it("returns a destroy action only when all guarded work is idle", () => {
+    expect(
+      getMainWindowCloseAction({
+        installTaskCount: 0,
+        hasRunningUpdateCenterTasks: false,
+      }),
+    ).toBe("destroy");
+  });
+});