feat(account): 实现账户解绑功能

[TremblingV5]

• 完成了 AccountApplication 中的 Unbind 方法 -调用了 accountService 的 Unbind 方法来执行实际的解绑操作
• 增加了错误处理和日志记录
• 返回了适当的响应对象，包括错误信息和成功状态

Link to an issue

What

How

Screenshots

How to test

Checklist

• Link to an issue if it really related.
• At least describe what this PR does.
• Use rebase to confirm that current branch doesn't conflict with main branch.
• Unit tests. At least do not reduce the unit test coverage.
• Checked and updated guidelines.md which used to describe how to build, deploy and use DouTok.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...ce/internal/applications/accountapp/application.go	0.00%	9 Missing ⚠️

Files with missing lines	Coverage Δ
...ce/internal/applications/accountapp/application.go	0.00% <0.00%> (ø)