fix(live-common/exchange): fix CAL service integration

[jnicoulaud-ledger]

✅ Checklist

• npx changeset was attached.
• not covered by automatic tests => isofonctional change
• Impact of the changes:
  • swap pane

📝 Description

Followup of #6853:

• fix internal URL used, bypassing Cloudflare cache
• fix unused field requested
• limit request to swap partners
• add X-Ledger-Client-Version header for monitoring

I did not fix in this PR:

• partners data is requested again at every refresh. It is loaded from disk cache but still seems unnecessary and will cause extra backend load if cache does not work
• I am not sure if using fetch() is the preferred way in Ledger Live. Other parts of Ledger Live use network shared lib that sets the X-Ledger-Client-Version header we need for monitoring: https://github.com/LedgerHQ/ledger-live/blob/develop/libs/live-network/src/network.ts#L251

❓ Context

• JIRA or GitHub link:

---

🧐 Checklist for the PR Reviewers

• The code aligns with the requirements described in the linked JIRA or GitHub issue.
• The PR description clearly documents the changes made and explains any technical trade-offs or design decisions.
• There are no undocumented trade-offs, technical debt, or maintainability issues.
• The PR has been tested thoroughly, and any potential edge cases have been considered and handled.
• Any new dependencies have been justified and documented.
• Performance considerations have been taken into account. (changes have been profiled or benchmarked if necessary)

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[gre]

minimal change suggested: just replace the header by

"X-Ledger-Client-Version": getEnv("LEDGER_CLIENT_VERSION")

[CremaFR]

Thanks I wasn't aware of this too
closing #6979

[jnicoulaud-ledger]

@CremaFR @lpaquet-ledger (I don't have merge rights)