feat(quick-260504-414-02): 新建主机对话框 UX 优化 #81

Job	Run time
Web Build	15s
Image Size Regression (BASE-04 ≤ 2GB)	2m 12s
Go Tests	1m 2s
Performance Benchmark (synthetic 10k, local baseline)	1m 13s
	4m 42s

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