add a generic captcha code 123456

[TremblingV5]

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What

How

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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 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...domain/entity/verificationcode/verificationcode.go	0.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
...domain/entity/verificationcode/verificationcode.go	0.00% <0.00%> (ø)

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