vey-daemon: reuse broadcast channel to update runtime config in place

[zh-jq]

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[codecov]

Codecov Report

❌ Patch coverage is 39.60784% with 154 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
lib/vey-daemon/src/listen/quic.rs	0.00%	68 Missing ⚠️
vey-proxy/src/serve/plain_quic_port/mod.rs	0.00%	35 Missing ⚠️
lib/vey-types/src/net/udp/listen.rs	0.00%	21 Missing ⚠️
vey-proxy/src/config/server/plain_quic_port.rs	0.00%	11 Missing ⚠️
lib/vey-socket/src/raw/mod.rs	62.50%	3 Missing ⚠️
lib/vey-daemon/src/listen/tcp.rs	60.00%	2 Missing ⚠️
lib/vey-daemon/src/listen/udp/listen.rs	60.00%	2 Missing ⚠️
lib/vey-daemon/src/listen/udp/receive.rs	60.00%	2 Missing ⚠️
lib/vey-daemon/src/listen/unix/datagram.rs	50.00%	2 Missing ⚠️
lib/vey-socket/src/raw/unix.rs	60.00%	2 Missing ⚠️
... and 6 more

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve the offline rebind before draining

On QuitRuntime for a plain_quic_port with offline_rebind_port configured, goto_offline now just waits on the endpoint while it remains bound to the public UDP port; on platforms using SO_REUSEPORT, the replacement listener and this idle endpoint can share traffic, so some new connection Initial packets can be delivered to the offline endpoint and hang. The previous rebind-to-offline-port path avoided that before wait_idle.

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