fix: 创建主机选择"无限制"时不再转换为 NULL，与 PATCH 路径保持一致 #31

Job	Run time
lint + dry-run 6 scenarios	12s
uat scenario=lan-only	7s
uat scenario=fail-closed-pkill	6s
uat scenario=loopback-only	4s
uat scenario=loopback-lan	3s
uat scenario=custom-domain	7s
uat scenario=custom-ip	7s
	46s

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