Docker Desktop on Windows demultiplexes inbound UDP from multiple source
IPs onto a single virtual socket, silently dropping packets from all but
one ESP32 node. This makes multi-node sensing setups appear to work
(WebSocket connects, packets flow on the host) while only one node's CSI
ever reaches the container.
Adds scripts/udp-relay.py (stdlib only) which collapses multi-source UDP
to a single loopback source so Docker's forwarding accepts every packet.
Verified locally: 6 packets from 3 distinct source ports all arrive at
the receiver from a single relay socket.
Updates docker/docker-compose.yml with an inline comment pointing
Windows users at the relay + 5006:5005 mapping. Linux/macOS hosts are
unaffected and need no changes.
Also documents the workaround alongside fixes for #188 (UI 404 from
relative --ui-path) and #438 (boot loop on --edge-tier 1/2 against
pre-v0.4.3.1 firmware) as new sections 9-11 of docs/TROUBLESHOOTING.md.
Supersedes the docs-only PR #413.
Closes#374, #386
Refs #188, #438, #301
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