docs: add hardware CLI README

[cursor]

Summary

• add a package README for @onekeyfe/hardware-cli
• document the public onekey-hw command surface, runtime model, and JSON output contract
• cover hidden-wallet session reuse, secure storage backends, and command limitations

Codepaths covered

• packages/hd-cli/src/cli.ts
• packages/hd-cli/src/chains.ts
• packages/hd-cli/src/sdk.ts
• packages/hd-cli/src/session.ts
• packages/hd-cli/src/pinentry.ts
• packages/hd-cli/src/storage/*

Knowledge gaps addressed

• there was no package-level README for the published hardware CLI
• the session caching flow and OS storage dependencies were undocumented
• developers did not have a single source for command groups, parameter pitfalls, and unsupported firmware-update behavior

Validation

• documentation-only change; verified statements against the current source files

  

[revan-zhang]

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