feat(android): add screenshotResizeRatio option for custom screenshot resizing

[quanru]

Summary

• Add screenshotResizeRatio option to AndroidDeviceOpt interface for customizing screenshot dimensions
• Apply custom resize ratio in screenshotBase64() method with default value of 1.0
• Add comprehensive unit tests covering different resize ratio scenarios
• Include debug logging for resize operations when custom ratio is applied

Test plan

• Add unit tests for custom resize ratio functionality
• Add unit tests for default behavior (ratio 1.0)
• Add unit tests for undefined ratio handling
• Verify existing screenshot functionality remains unchanged
• Test with real Android device using different resize ratios

🤖 Generated with Claude Code

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