fix: identify_display 中跟踪 _SetDeviceGammaRamp 返回值#2
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闪烁循环中之前忽略了 SetDeviceGammaRamp 的返回值，如果伽马写入被 静默拒绝（如远程桌面、权限不足），屏幕不会闪烁但函数仍返回 True。 修复后，在循环中检查每次调用的返回值，失败时记录警告并 break， 最终恢复后返回 False。
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Summary
修复
identify_display()在闪烁循环中忽略_SetDeviceGammaRamp返回值的问题。_SetDeviceGammaRamp的返回值False而非True测试
test_identify_flash_fails：模拟第一次闪白屏调用失败test_identify_blank_fails：模拟第一次闪黑屏调用失败