fix(security): URLTest 与 fetch 默认拒绝私网目标#24
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新增 core-outbound net_guard，拦截 loopback/RFC1918/CGNAT/链路本地/云元数据。 URLTest 与订阅/规则集 fetch 在解析前后及 redirect 每跳复查目标。 fetch 日志仅记录 host；单测可通过 allow_private_targets 显式放行本地服。
从 health 中剥离 dial 短期 dead 逻辑，本 PR 只保留目标拦截。
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@copilot resolve the merge conflicts in this pull request |
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背景
控制面 URLTest 与订阅/规则集 fetch 可被用作 SSRF：探测 loopback、RFC1918、云元数据等目标。
实现
net_guard
core-outbound::net_guard，统一判断主机名/IP 是否允许作为外部拉取目标fetch
FetchOptions::allow_private_targets默认 false，仅单测可显式放行URLTest
test_node_with在 dial 前拦截私网/元数据目标安全与兼容边界
验证
cargo test -p core-outbound -p core-fetch -p core-runtimeallow_private_targets=true下通过127.0.0.1/169.254.169.254返回 BlockedTarget