feat(oidc): add roles claim field to provider settings

[GatewayJ]

Pull Request

Description

Adds Roles claim (roles_claim) to the OIDC provider form and API payload so the Console stays aligned with RustFS admin API. Loading and saving now includes roles_claim, preventing saves from clearing a previously configured value on the server.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Code refactoring
• Performance improvement
• Test improvements
• Security fix

Testing

• Unit tests added/updated
• Manual testing completed

pnpm exec eslint types/oidc.ts "app/(dashboard)/oidc/page.tsx" components/oidc/form.tsx

Checklist

• Code follows the project's style guidelines
• Self-review completed
• TypeScript types are properly defined
• All commit messages are in English (Conventional Commits)
• All existing tests pass (full tsc may report existing Next.js .next type issues in this environment)
• No new dependencies added, or they are justified

Related Issues

Closes #

Screenshots (if applicable)

N/A

Additional Notes

Pairs with RustFS server support for roles_claim on OIDC provider config. i18n: full strings for en-US and zh-CN; other locales include English placeholders for the new keys.