Fix issue1110

[JSE19]

Description

Closes #1110

Changes proposed

What were you told to do?

feat(routes-f): channel language preference

Manage channel primary stream language and secondary supported languages.

Requirements:

• GET ?creator_id returns { primary, secondary: string[] }
• PUT to update with BCP 47 codes
• Validate codes against bundled supported list
• Cap secondary at 4
• Tests cover validation and cap

What did you do?

Created a self-contained language preference route at app/api/routes-f/language/:

• route.ts — Two handlers:
  • GET — Returns { primary, secondary } for a creator (empty strings if never set)
  • PUT — Accepts { creator_id, primary, secondary }, validates all codes against the bundled list, caps secondary at 4 (zod .max(4)), rejects duplicate secondary codes
• _lib/languages.ts — Bundled list of 40 common BCP 47 codes (en, es, fr, de, ja, ko, zh, ar, hi, etc.), shared in-memory store, isValidCode() helper
• __tests__/route.test.ts — Tests covering: empty response for unknown creator, store and retrieve, unsupported primary code rejected, unsupported secondary code rejected, >4 secondary rejected, duplicate secondary rejected, overwrite previous preferences

Check List

• My code follows the code style of this project.
• This PR does not contain plagiarized content.
• The title and description of the PR is clear and explains the approach.
• I am making a pull request against the main branch (left side).
• My commit messages styles matches our requested structure.
• My code additions will fail neither code linting checks nor unit test.
• I am only making changes to files I was requested to.

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