feat(update): 重构自动更新系统，使用 electron-updater 替代手动下载

- CI 构建 macOS 拆分为 x64/arm64 分别构建，合并 latest-mac.yml
- 主进程使用 electron-updater 管理检查、下载、安装全流程
- 渲染进程 UpdateModal 改为响应式同步主进程更新状态
- IPC 通道统一为 app-update:* 系列
- 窗口拦截外部链接在系统浏览器打开
- 新增 5 语言更新相关国际化文案

scripts/merge_latest_mac_yml.mjs

@@ -0,0 +1,119 @@
+import { mkdirSync, readFileSync, writeFileSync } from 'node:fs';
+import { dirname } from 'node:path';
+
+function readScalar(line, prefix) {
+  return line.slice(prefix.length).trim().replace(/^'/, '').replace(/'$/, '');
+}
+
+function parseLatestMacYml(filePath) {
+  const content = readFileSync(filePath, 'utf8');
+  const lines = content.split(/\r?\n/);
+  const result = {
+    version: '',
+    files: [],
+    path: '',
+    sha512: '',
+    releaseDate: ''
+  };
+
+  let currentFile = null;
+
+  for (const line of lines) {
+    if (!line.trim()) {
+      continue;
+    }
+
+    if (line.startsWith('version: ')) {
+      result.version = readScalar(line, 'version: ');
+      continue;
+    }
+
+    if (line.startsWith('path: ')) {
+      result.path = readScalar(line, 'path: ');
+      continue;
+    }
+
+    if (line.startsWith('sha512: ')) {
+      result.sha512 = readScalar(line, 'sha512: ');
+      continue;
+    }
+
+    if (line.startsWith('releaseDate: ')) {
+      result.releaseDate = readScalar(line, 'releaseDate: ');
+      continue;
+    }
+
+    if (line.startsWith('  - url: ')) {
+      currentFile = {
+        url: readScalar(line, '  - url: ')
+      };
+      result.files.push(currentFile);
+      continue;
+    }
+
+    if (line.startsWith('    sha512: ') && currentFile) {
+      currentFile.sha512 = readScalar(line, '    sha512: ');
+      continue;
+    }
+
+    if (line.startsWith('    size: ') && currentFile) {
+      currentFile.size = Number.parseInt(readScalar(line, '    size: '), 10);
+    }
+  }
+
+  return result;
+}
+
+function uniqueFiles(files) {
+  const fileMap = new Map();
+
+  for (const file of files) {
+    fileMap.set(file.url, file);
+  }
+
+  return Array.from(fileMap.values());
+}
+
+function stringifyLatestMacYml(data) {
+  const lines = [`version: ${data.version}`, 'files:'];
+
+  for (const file of data.files) {
+    lines.push(`  - url: ${file.url}`);
+    lines.push(`    sha512: ${file.sha512}`);
+    lines.push(`    size: ${file.size}`);
+  }
+
+  lines.push(`path: ${data.path}`);
+  lines.push(`sha512: ${data.sha512}`);
+  lines.push(`releaseDate: '${data.releaseDate}'`);
+
+  return `${lines.join('\n')}\n`;
+}
+
+const [x64Path, arm64Path, outputPath] = process.argv.slice(2);
+
+if (!x64Path || !arm64Path || !outputPath) {
+  console.error(
+    'Usage: node scripts/merge_latest_mac_yml.mjs <latest-mac-x64.yml> <latest-mac-arm64.yml> <output.yml>'
+  );
+  process.exit(1);
+}
+
+const x64Data = parseLatestMacYml(x64Path);
+const arm64Data = parseLatestMacYml(arm64Path);
+
+if (x64Data.version !== arm64Data.version) {
+  console.error(
+    `Version mismatch between mac update files: ${x64Data.version} !== ${arm64Data.version}`
+  );
+  process.exit(1);
+}
+
+const mergedData = {
+  ...x64Data,
+  files: uniqueFiles([...x64Data.files, ...arm64Data.files]),
+  releaseDate: arm64Data.releaseDate || x64Data.releaseDate
+};
+
+mkdirSync(dirname(outputPath), { recursive: true });
+writeFileSync(outputPath, stringifyLatestMacYml(mergedData), 'utf8');