Optional TLS for the control-plane transport (fixes #16) - #25
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Fixes #16. The coordination transport was plaintext TCP + HTTP/1.1 Upgrade on :80, so it couldn't reach a Headscale behind an HTTPS reverse proxy — or the hosted Tailscale service, which is HTTPS-only. This adds a ctrl_tls flag that wraps the coord socket in TLS (reusing the DERP client's mbedTLS-over-lwIP setup; VERIFY_NONE, since the ts2021 Noise handshake authenticates the control plane), defaulting to port 443.
Also included: a build fix for WiFi-less SoCs (ESP32-P4), an Ethernet fix for the DISCO local endpoint, and a minimal Ethernet example.
Verified on ESP32-P4 over Ethernet against the official Tailscale service (controlplane.tailscale.com): the node registers, receives MapResponse, connects to DERP, and shows up in the tailnet.