✨enhancement: Model sources should not be hard coded from frontend

[louis-menlo]

Describe Your Changes

Currently, Jan-nano is being updated manually on frontend which require app to be up-to-date everytime we change the model repo structure.

Move it to an extension and make it dynamically synced. The current repo info will be shipped with the extension, but it will update itself for latest stats like download numbers.

Self Checklist

• Added relevant comments, esp in complex areas
• Updated docs (for bug fixes / features)
• Created issues for follow-up changes or refactoring needed

---

Important

Model sources are now dynamically synced, removing hardcoded references in the frontend.

• Behavior:
  • Model sources are now dynamically synced in index.ts using defaultModelSources.
  • Removed hardcoded model references in models.ts.
• Extensions:
  • Added defaultModelSources array in index.ts for default model sources.
  • Updated fetchModelsHub() in index.ts to include defaultModelSources.
• Services:
  • Removed hardcodedModel from fetchModelSources() and fetchModelHub() in models.ts.

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[ellipsis-dev]

Caution

Changes requested ❌

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1. extensions/model-extension/src/index.ts:28

• Draft comment:
  Typo in comment: 'Defaul mode sources' should be 'Default model sources'.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 50% None

2. extensions/model-extension/src/index.ts:295

• Draft comment:
  DEFAULT_MODEL_SOURCES is used but not defined; use the declared 'defaultModelSources' instead.
• Reason this comment was not posted:
  Comment was not on a location in the diff, so it can't be submitted as a review comment.

3. web-app/src/services/models.ts:35

• Draft comment:
  The comment refers to 'hardcoded model' being prepended, which is outdated. Update or remove the comment to reflect current behavior.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 50% None

4. web-app/src/services/models.ts:52

• Draft comment:
  The comment about prepending the hardcoded model for hub data is misleading now. Update the comment to match the current logic.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 50% None

5. extensions/model-extension/src/index.ts:29

• Draft comment:
  Typo: 'Defaul mode sources' seems to be a mistake. Consider correcting it to 'Default model sources'.
• Reason this comment was not posted:
  Decided after close inspection that this draft comment was likely wrong and/or not actionable: usefulness confidence = 10% vs. threshold = 50% While this is technically correct and points out a real typo in new code, comments about minor typos in documentation are generally not important enough to warrant a PR comment. The typo doesn't affect functionality and is a very minor issue. Documentation typos are better handled through direct fixes or separate documentation reviews. The typo could cause confusion for future developers reading the code. Documentation quality is important for maintainability. While documentation quality matters, this particular typo is extremely minor and obvious. The meaning is still clear despite the typo. This comment should be deleted as it addresses a trivial documentation issue that doesn't meaningfully impact code quality or functionality.

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[ellipsis-dev]

Important

Looks good to me! 👍

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1. extensions/model-extension/resources/default.json:127

• Draft comment:
  Ensure the model id update ('jan-nano-4b') aligns with the new naming convention and that the file size remains accurate.
• Reason this comment was not posted:
  Confidence changes required: 0% <= threshold 50% None

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