feat: 内置阅读器、批注笔记与 AI 助手，发布 1.3.0

新增 PDF/EPUB/MOBI/AZW 内置阅读器，PDF 分段读取支持超大文件，
批注、读书与画布笔记、封面生成与本地导入。AI 助手支持三种协议、
图像上下文与安全 Markdown 渲染，上下文范围改为 选中/当前页/全文，
页面与全文无需选中文本即可发送，全文会提示可能超出模型限制。

便携版输出目录固定为 PeopleLib-windows-x64，不再随版本号变化，
避免升级后 data/ 被遗留在旧目录。

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

src/_test/electron/startup.integration.js

@@ -0,0 +1,77 @@
+const fs = require('fs');
+const os = require('os');
+const path = require('path');
+const { app, BrowserWindow } = require('electron');
+
+const ROOT = path.resolve(__dirname, '..', '..', '..');
+const TMP = fs.mkdtempSync(path.join(os.tmpdir(), 'peoplelib-startup-ui-'));
+app.setPath('appData', TMP);
+process.env.ELECTRON_DISABLE_SECURITY_WARNINGS = 'true';
+
+const results = [];
+function check(name, pass, detail) {
+  results.push([pass ? 'OK' : 'FAIL', name, detail || '']);
+}
+
+async function waitUntil(fn, timeout = 10000) {
+  const end = Date.now() + timeout;
+  while (Date.now() < end) {
+    try {
+      const value = await fn();
+      if (value) return value;
+    } catch (e) { /* 窗口仍在加载 */ }
+    await new Promise((resolve) => setTimeout(resolve, 25));
+  }
+  throw new Error(`等待条件超时（${timeout}ms）`);
+}
+
+function printSummary() {
+  console.log('\n========== 启动响应集成验证 ==========');
+  for (const [status, name, detail] of results) {
+    console.log(`${status.padEnd(5)} ${name}${detail ? `  [${detail}]` : ''}`);
+  }
+  const failed = results.filter((item) => item[0] === 'FAIL').length;
+  console.log(`\n通过 ${results.length - failed}/${results.length}`);
+  return failed;
+}
+
+app.whenReady().then(async () => {
+  const library = require(path.join(ROOT, 'src', 'library', 'store'));
+  let scanStartedAt = 0;
+  library.scan = () => {
+    scanStartedAt = Date.now();
+    Atomics.wait(new Int32Array(new SharedArrayBuffer(4)), 0, 0, 2200);
+    return { added: 0, missing: 0, total: 0 };
+  };
+
+  const startedAt = Date.now();
+  require(path.join(ROOT, 'main.js'));
+  const win = await waitUntil(() => (
+    BrowserWindow.getAllWindows().find((item) => item.getTitle() === 'PeopleLib')
+  ));
+  win.hide();
+  await waitUntil(() => win.webContents.executeJavaScript(
+    `document.readyState === 'complete'
+      && ['dark', 'light'].includes(document.documentElement.dataset.uiTheme)`
+  ));
+  const configReadyMs = Date.now() - startedAt;
+  check('慢速书库扫描不会阻塞窗口配置加载', configReadyMs < 1200, `${configReadyMs}ms`);
+
+  await waitUntil(() => scanStartedAt > 0, 7000);
+  check('启动维护在首屏完成后延迟执行', scanStartedAt - startedAt >= 1400,
+    `${scanStartedAt - startedAt}ms`);
+
+  for (const window of BrowserWindow.getAllWindows()) {
+    if (!window.isDestroyed()) window.destroy();
+  }
+  const failed = printSummary();
+  app.exit(failed ? 1 : 0);
+}).catch((error) => {
+  console.error('异常:', error);
+  check('启动验证未发生异常', false, error.message || String(error));
+  for (const window of BrowserWindow.getAllWindows()) {
+    if (!window.isDestroyed()) window.destroy();
+  }
+  printSummary();
+  app.exit(1);
+});