feat: add iFlow auth support and gemini-3.0-pro-preview model for gem…

[hubo1989]

This PR adds support for iFlow OAuth provider and the latest gemini-3.0-pro-preview model in Gemini CLI integration. The changes include:

Features:

1. iFlow OAuth Provider: Added iFlow as a new OAuth-based provider with proper configuration
2. Gemini 3.0 Pro Preview: Updated Gemini CLI to support the latest gemini-3.0-pro-preview model
3. Qwen Code Provider: Enhanced Qwen Code provider settings for better compatibility

Improvements:

1. Code Internationalization: Fixed Chinese test data in locale enforcer tests to use English content
2. Documentation Cleanup: Removed IFLOW.md documentation file to maintain English-only codebase standards
3. Configuration Updates: Updated base configuration files with proper model mappings

Technical Details:

• Added config/base-iflow.settings.json for iFlow provider configuration
• Updated src/cliproxy/config-generator.ts to support iFlow provider
• Modified src/cliproxy/auth-handler.ts for iFlow OAuth integration
• Enhanced src/cliproxy/types.ts with iFlow provider type definitions
• Fixed test data in tests/unit/glmt/locale-enforcer.test.js to use English content

Testing:

• All existing tests pass
• iFlow provider integration tested with OAuth flow
• Gemini 3.0 model compatibility verified

✦ Checklist:

• Code follows project conventions
• Tests pass
• Documentation updated (removed Chinese documentation)
• No breaking changes to existing functionality