feat: 构建系统重构 + VCHSM 架构迁移 + 右键菜单修复 + 尺寸参数统一

## 构建、打包与分发系统重构 (build/)

- 构建系统收敛至 build/ 目录：build.mjs + electron-builder.js + 6 个脚本

- electron-builder 配置从 package.json 提取为 build/electron-builder.js

- 新增 --edition (personal/enterprise) 和 --channel (stable/beta/alpha) 参数

- OSS 路径按渠道隔离

- 新增 pre-build-check.mjs：Git/CHANGELOG/版本/环境变量校验

- 新增 bump-version.mjs：版本号管理 + CHANGELOG 自动生成

- updater.ts 发送 channel/edition/deviceFingerprint

- 新增 src/shared/utils/rollout.ts 灰度测试工具

- 新增 10 条 NPM 脚本

## VCHSM 五层架构迁移

- 7 个业务模块 + ~500 处导入路径同步

## 修复

- MediaCardContextMenu 改用共享 ContextMenu 组件

- ComboBox 尺寸参数显示统一 (size-format.ts)

## 文档

- UpdateA.md / build/README.md / README.md / .env.example 更新

Co-Authored-By: Claude <noreply@anthropic.com>

build/electron-builder.js

@@ -0,0 +1,78 @@
+// ============================================================
+// electron-builder 配置
+//
+// 从 package.json "build" 字段提取，通过环境变量动态注入参数。
+// build.mjs 负责设置 HEIXIU_* 环境变量后调用 electron-builder。
+//
+// 用法：
+//   HEIXIU_EDITION=enterprise HEIXIU_CHANNEL=beta npx electron-builder --win --config build/electron-builder.js
+// ============================================================
+
+import { readFileSync } from 'node:fs';
+import { join, dirname } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const ROOT = join(__dirname, '..');
+
+const pkg = JSON.parse(readFileSync(join(ROOT, 'package.json'), 'utf-8'));
+
+const edition = process.env.HEIXIU_EDITION || 'personal';
+const channel = process.env.HEIXIU_CHANNEL || 'stable';
+const releaseDirName = process.env.HEIXIU_RELEASE_DIR_NAME || pkg.version;
+
+const editionLabel = edition === 'enterprise' ? '企业版' : '';
+const productName = editionLabel
+  ? `船长·HeiXiu·${editionLabel}`
+  : '船长·HeiXiu';
+
+/** @type {import('electron-builder').Configuration} */
+const config = {
+  appId: edition === 'enterprise'
+    ? 'com.heixiu.enterprise'
+    : 'com.heixiu.electron',
+  productName,
+  asar: true,
+  directories: {
+    output: `release/${releaseDirName}`,
+  },
+  files: [
+    'dist',
+    'dist-electron',
+  ],
+  electronDownload: {
+    mirror: 'https://npmmirror.com/mirrors/electron/',
+  },
+  // generic provider 仅作为 electron-updater 的 fallback，
+  // 实际版本检查通过自定义 HeiXiuProvider → API
+  publish: {
+    provider: 'generic',
+    url: 'https://update.heixiu.com',
+  },
+  win: {
+    icon: 'src/assets/logo/heixiu.ico',
+    target: [{ target: 'NSIS', arch: ['x64'] }],
+    artifactName: '${productName}-Windows-${version}-Setup.${ext}',
+  },
+  mac: {
+    icon: 'src/assets/logo/heixiu.icns',
+    target: ['dmg'],
+    artifactName: '${productName}-Mac-${version}-Installer.${ext}',
+  },
+  linux: {
+    icon: 'src/assets/logo/HX.png',
+    target: ['AppImage'],
+    artifactName: '${productName}-Linux-${version}.${ext}',
+  },
+  nsis: {
+    oneClick: false,
+    perMachine: false,
+    allowToChangeInstallationDirectory: true,
+    deleteAppDataOnUninstall: false,
+    differentialPackage: true,
+    installerIcon: 'src/assets/logo/heixiu.ico',
+    uninstallerIcon: 'src/assets/logo/heixiu.ico',
+  },
+};
+
+export default config;