This commit eliminates the confusing requirePassword field that was causing
authentication issues where users couldn't disable password requirements.
Changes:
- Remove requirePassword field from database schema and migrations
- Simplify SSH authentication logic by removing special case branches
- Update frontend to remove requirePassword UI controls
- Clean up translation files to remove unused strings
- Support standard SSH empty password authentication
The new design follows the principle of "good taste" - password field itself
now expresses the requirement: null/empty = no password auth, value = use password.
Fixes the issue where setting requirePassword=false didn't work as expected.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
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