chore: upgrade openapi-ts to 0.99.0

[hyoban]

Important

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2. Ensure there is an associated issue and you have been assigned to it
3. Use the correct syntax to link this PR: Fixes #<issue number>.

Summary

• Upgrade @hey-api/openapi-ts back to 0.99.0 and regenerate API contracts with the updated generator.
• Keep the console contract entry generation fix so 0.99.0 does not emit extra root client, core, client.gen.ts, sdk.gen.ts, or types.gen.ts artifacts.
• Do not add a local discriminator schema workaround or smoke test; the generated FormInputConfig discriminator change remains visible in the contract diff for upstream evaluation.
• Make autofix.ci regenerate frontend contracts when contract generator inputs or dependency files change, not only when api/** changes.
• Linked issue: No linked issue.

Upstream status

This PR should stay as a draft until the upstream discriminator issue is fixed and released by @hey-api/openapi-ts: hey-api/hey-api#4138. The candidate upstream fix is hey-api/hey-api#4139.

Until that lands in a published release, the generated Zod v4 contracts can still expose the const + default discriminator issue instead of applying a local Dify workaround.

Validation:

• pnpm --dir packages/contracts gen-api-contract-from-openapi
• pnpm --dir packages/contracts type-check
• git diff --check

From Codex

Screenshots

N/A

Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint && make type-check (backend) and cd web && pnpm exec vp staged (frontend) to appease the lint gods

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.40%. Comparing base (d8f3be4) to head (dde1e5c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #38152      +/-   ##
==========================================
+ Coverage   85.34%   85.40%   +0.05%     
==========================================
  Files        4967     5122     +155     
  Lines      258427   262758    +4331     
  Branches    49034    50092    +1058     
==========================================
+ Hits       220567   224398    +3831     
- Misses      33568    34068     +500     
  Partials     4292     4292              

Flag	Coverage Δ
cli	88.45% <ø> (?)
dify-ui	94.93% <ø> (ø)
web	85.05% <ø> (ø)

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