docs: remove multi-input API references

[arcticfloyd1984]

Part of the multi-input API deprecation project. Removes:

• The swap-multi-input API reference page
• Multi-input navigation entry from docs.json
• Multi-input section from chain-abstraction use case
• Multi-input mention from app-fees warning
• Multi-input link from API overview

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[github-actions]

Claude finished @arcticfloyd1984's task in 41s —— View job

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Code Review: Remove Multi-Input API References

• Review PR diff and changed files
• Check for any remaining multi-input references
• Post review feedback

Overall: Looks good! Clean removal of multi-input references across the docs. One thing to flag:

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Remaining multi-input reference

There's still a "Multi-input" entry in the supported transaction types table at features/app-fees.mdx:47:

| Multi-input | ❌ |

Since the multi-input API is being deprecated and removed from docs, this table row should likely be removed as well to avoid referencing a feature that no longer exists in the documentation.

Fix this →

Minor note on references/api/overview.mdx

After removing the multi-input link, the "Advanced" section (overview.mdx:37-39) now only contains a single entry (Fast Fill). Not necessarily an issue, but worth noting — if more items get removed in the future, consider whether the "Advanced" heading is still warranted.

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Everything else is clean — nav entry removed from docs.json, API page deleted, warning text updated, and chain-abstraction section removed. No broken links detected from the changes.

[github-actions]

Claude finished @arcticfloyd1984's task in 49s —— View job

---

Code Review: Remove Multi-Input API References

• Review PR diff and changed files
• Check for remaining multi-input references
• Post review feedback

Overall: Looks good! Clean removal of all multi-input references. The latest commit (68f7ba3) addressed the previously flagged table row in app-fees.mdx — no remaining multi-input references found in the codebase.

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Minor note on references/api/overview.mdx

After the removal, the "Advanced" section (lines 37-39) now contains only a single entry (Fast Fill). Not a blocker, but worth noting — if more items are removed in the future, consider whether the heading is still warranted or if the entry could be folded into the section above.

Newline fix in features/app-fees.mdx

The diff also adds a trailing newline to the end of app-fees.mdx (previously missing). Good housekeeping.

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No issues found — LGTM.