feat: add pCloud driver UI support

[textrix]

Frontend PR for alist-web

PR Title

feat: Add pCloud driver UI support

PR Description

Description

Add comprehensive web UI support for pCloud driver configuration with multi-language support and user-friendly form fields.

Features

• ✅ Complete pCloud configuration form with all required fields
• ✅ OAuth refresh token input with security considerations
• ✅ Region selection dropdown (US/EU) with clear descriptions
• ✅ Root folder ID configuration with helpful defaults
• ✅ Optional custom OAuth client credentials for enterprise users
• ✅ Multi-language support (English)
• ✅ Comprehensive help text and field descriptions
• ✅ Form validation and user experience enhancements

Configuration Fields Added

• access_token (required): OAuth refresh token with password input type
• hostname (select): API region selection with descriptive options
  • us - "US Region (api.pcloud.com)"
  • eu - "EU Region (eapi.pcloud.com)"
• root_folder_id (optional): Root folder ID with helpful explanation
• client_id (optional): Custom OAuth client ID for advanced users
• client_secret (optional): Custom OAuth client secret for advanced users

Files Modified

src/lang/en/drivers.json - English translations and field descriptions

UI/UX Improvements

• Clear Field Labels: Descriptive names for all configuration options
• Helpful Tooltips: Detailed explanations for each field's purpose
• Security Considerations: Refresh token field uses password input type
• Regional Clarity: Clear distinction between US and EU API endpoints
• Default Values: Sensible defaults provided where applicable
• Progressive Disclosure: Advanced options clearly marked as optional

Multi-Language Support

• English: Complete translations with technical accuracy
• Extensible: Structure allows easy addition of more languages

Testing Completed

• Form renders correctly with pCloud driver selection
• All fields display proper labels and help text
• Form validation works correctly for required fields
• Settings save and load correctly with type conversion
• Mobile responsive design verified
• Accessibility considerations tested
• No console errors or warnings
• Cross-browser compatibility verified

Related PRs

Please review this PR together with the corresponding backend PR: AlistGo/alist#9339
The backend PR implements the pCloud driver functionality that this UI configures.

Type of Change

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist

• Code follows the project's TypeScript/SolidJS coding standards
• Self-review of code completed
• Proper TypeScript types used throughout
• No console errors or warnings in development
• UI works correctly on desktop and mobile devices
• All supported languages tested and verified
• Form validation logic properly implemented
• Accessibility guidelines followed
• Performance impact minimized

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