docs: move gas policy Admin APIs under Tools (option E: wallets CRUD guide)

[CodesMcCabe]

Summary

• Moves Gas Policy Admin API endpoints from Wallets → API Reference into Tools → Admin API → Gas Policies.
• Replaces the wallets policy-management endpoint table with a Manage gas policies via API guide: dashboard vs API, create/activate, update/inspect/delete, and an endpoint reference table.
• Adds wallets sidebar links from API Reference and Sponsor gas to that guide so wallets owns the CRUD workflow and Admin API owns the reference.

This is option E of four IA variants (recommended, A, B, E). Heaviest wallets content: a real CRUD guide instead of a link table.

Test plan

• Confirm Tools → Admin API shows a Gas Policies section
• Confirm Wallets API Reference links to the new guide, not the Admin API spec
• Confirm Sponsor gas has a "Manage policies via API" sidebar link to the guide
• Confirm Low-level infra → Policy Management now shows "Manage policies via API" with create/activate steps and links to Admin API endpoints
• Confirm old wallets Admin API endpoint URLs redirect to /docs/admin-api/gas-policies/:method

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[github-actions]

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Fix the invalid create-policy payload

The new copy-paste example does not conform to the Create Policy schema: Rules.startTimeUnix is required by src/openapi/admin/admin.yaml, and maxSpendUsd must be a number rather than the string sent here. Users following this guide can receive request-validation errors before reaching the activation step; include startTimeUnix and send maxSpendUsd as 100.

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