refactor: types

What does this PR do?

• Refactored to add types in client

• Moved the backend langmap and schema to firefish-js

• Fixed the bug of softly mute languages not working by types checking.

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• This is a refactor
• I agree to follow this project's Contribution Guidelines
• I have made sure to test this pull request
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If this merge request makes changes to the Firefish API, please update docs/api-change.md

• I updated the document / This merge request doesn't include API changes