fix(registry): sort group servers alphabetically

[fengjikui]

Summary

• Sort registry group detail rows alphabetically after combining local and remote servers.
• Add a regression assertion that mixed local/remote group servers render in one unified alphabetical order.

Fixes #1956

Validation

• pnpm exec vitest run 'renderer/src/routes/__tests__/registry-group_.$name.test.tsx'
• pnpm run prettier
• pnpm run lint
• pnpm run type-check
• git diff --check