fix(quota): omit absent fetch headers

[INONONO66]

Summary

• build quota fetch options without a headers key when callers do not provide headers
• add focused coverage for absent and present headers in quota fetchJson

Verification

• bun test tests/unit/cliproxy-quota-helpers.test.ts
• ./node_modules/.bin/tsc --noEmit --pretty false --exactOptionalPropertyTypes true 2>&1 | rg "src/cliproxy/quota/helpers.ts|tests/unit/cliproxy-quota-helpers.test.ts" || true
• ./node_modules/.bin/tsc --noEmit --pretty false --noUncheckedIndexedAccess true 2>&1 | rg "tests/unit/cliproxy-quota-helpers.test.ts" || true
• ./node_modules/.bin/tsc --noEmit --pretty false
• git diff --check
• bun run release-check
• LSP diagnostics for src/cliproxy/quota/helpers.ts and tests/unit/cliproxy-quota-helpers.test.ts: no diagnostics

---

Summary by cubic

Stop including the headers field in quota fetchJson requests when callers don’t pass headers. This prevents sending an empty headers object and aligns with upstream expectations.

• Bug Fixes
  • Build UpstreamClient.fetch options without headers unless provided.
  • Added unit tests to verify omission/preservation of headers in fetchJson.

^{Written for commit d63edc5. Summary will update on new commits.}

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: f4dbd221-5f98-4c99-ae18-0431a8b11935

📥 Commits

Reviewing files that changed from the base of the PR and between d7be0a9 and d63edc5.

📒 Files selected for processing (2)

• src/cliproxy/quota/helpers.ts
• tests/unit/cliproxy-quota-helpers.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/quota-fetch-optional-headers

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[cubic-dev-ai]

No issues found across 2 files

_{Re-trigger cubic}