fix(ci): add feat_v4.x branch coverage and release version assertion

[xiaoyatong]

问题

修复两个 P0 问题（详见 `docs/optimization-issues.md`）：

P0-1：CI 未覆盖当前开发分支 feat_v4.x

`ci.yml` 只监听 `next` 和 `feat_v3.x`，在 `feat_v4.x` 上的 push 不触发任何 lint / test / build。

P0-2：发布前缺少版本一致性校验

`release-beta.yml` 和 `release.yml` 的 build 与 publish 步骤之间没有断言，若构建产物的 `release/h5` 或 `release/taro` 版本与主包不一致，publish 仍会执行。

变更

• `ci.yml`：push 触发分支新增 `feat_v4.x`
• `release-beta.yml`：push 触发分支新增 `feat_v4.x`；在 build 与 publish 之间新增 `Verify release package versions` 步骤，版本不一致时 `exit 1` 阻断发布
• `release.yml`：同样新增 `Verify release package versions` 步骤

验证方式

• 在 `feat_v4.x` 分支推送后确认 CI 工作流被触发
• 验证 `release/h5/package.json` 与 `package.json` 版本一致时发布步骤正常通过
• 验证版本不一致时 `Verify release package versions` 步骤报错并阻断后续 publish

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