feat: 增加可选的 UDP 缓冲上限设置 - #1318
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部分 Mihomo/quic-go 构建不显式调用 setsockopt，UDP socket 缓冲直接 继承内核 default 值。实测仅提高 max 无法改善吞吐（仍被限制在约 229KB），需同时提高 rmem_default/wmem_default 才生效。 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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小米/红米官方固件默认把内核 UDP 缓冲限制在 229376 字节（
rmem_max/wmem_max及默认值rmem_default/wmem_default），导致 Mihomo 使用 Hysteria2/QUIC 时吞吐严重受限。实测（百兆宽带，经路由器透明代理）：
部分 Mihomo/quic-go 构建不显式调用 setsockopt，socket 缓冲直接继承内核 default 值，因此仅提高
max无法生效，需同时提高default。本次在功能设置中新增独立开关（默认关闭）。开启后仅在 CrashCore 启动前把低于 16 MiB 的
rmem_max/wmem_max/rmem_default/wmem_default提高至 16 MiB；不覆盖用户已有的更高值，关闭时不会降低现有系统值。