docs: move gas policy Admin APIs under Tools (recommended: hub + sidebar links)

[CodesMcCabe]

Summary

• Moves Gas Policy Admin API endpoints from Wallets → API Reference into Tools → Admin API → Gas Policies (/docs/admin-api/gas-policies/{operation}).
• Keeps the wallets policy-management hub page and adds sidebar links from Wallets → API Reference → Gas Manager and Transactions → Sponsor gas, so policy CRUD stays discoverable in wallet docs.
• Retargets existing endpoint links and adds redirects from the old wallets Admin API URLs.

This is the recommended option of four IA variants (recommended, A, B, E). Sibling PRs: option A, option B, option E.

Test plan

• Confirm Tools → Admin API shows a Gas Policies section with create/get/replace/delete/status/stats/sponsorships endpoints
• Confirm Wallets API Reference no longer mounts the Admin API spec and instead links to /docs/admin-api/gas-policies/create-policy
• Confirm Sponsor gas has a "Manage policies via API" sidebar link to the wallets hub
• Confirm Low-level infra → Policy Management → API Endpoints still lists CRUD operations and now points at the new Admin API URLs
• Hit an old URL such as /docs/wallets/api-reference/gas-manager-admin-api/admin-api-endpoints/create-policy and confirm it redirects

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