docs: add a required fields by corridor page

[JasonCWang]

Adds a page under Payouts & B2B > Managing accounts that lists, for every
currency and payment rail, the details the sender and the recipient's account
must supply. Readers filter by sender type, recipient type, and currency.

The table itself is generated upstream from the payment integrations and
arrives through the existing schema sync, so it stays current as corridors
change. This PR carries the first copy so the page renders.

Hand-written pieces:

• payouts-and-b2b/depositing-funds/required-fields.mdx, the page that includes
  the snippet
• corridor-fields.js, the filter behaviour
• style.css, the filter bar and empty state, using the existing ls tokens
• docs.json, one navigation entry

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[JasonCWang]

@greptile review

[greptile-apps]

Greptile Summary

Adds a documentation page that presents required sender and recipient account fields by corridor.

• Adds generated corridor data covering currencies, payment rails, and account-type combinations.
• Adds sender, recipient, and currency filter controls with supporting styles and client-side behavior.
• Registers the page under Payouts & B2B account management.

Confidence Score: 5/5

The PR appears safe to merge because no blocking failure remains within the eligible follow-up review scope.

No blocking failure remains.

Important Files Changed

Filename	Overview
mintlify/corridor-fields.js	Adds delegated client-side filtering and empty-state handling for corridor rows.
mintlify/snippets/corridor-required-fields.mdx	Adds the generated corridor requirements table and its filter controls.
mintlify/payouts-and-b2b/depositing-funds/required-fields.mdx	Adds the documentation page that renders the generated corridor snippet.
mintlify/docs.json	Adds the required-fields page to the Managing accounts navigation group.
mintlify/style.css	Adds responsive filter, table, hidden-state, empty-state, and dark-mode styling.

_{Reviews (2): Last reviewed commit: "docs: add a required fields by corridor ..." | Re-trigger Greptile}