huddle 1.1.5 — permanent clearnet address

A small release that makes the clearnet fallback permanent — for users in regions where Tor itself is blocked.

• Stable clearnet relay default. DEFAULT_CLEARNET_URL now points at a permanent Cloudflare *.workers.dev proxy in front of the operator's relay, instead of a raw *.trycloudflare.com quick-tunnel hostname that rotated on every restart and went stale. The proxy reads the relay's current backend from KV (kept fresh automatically), so the address is durable.
• The Tor onion stays the canonical, preferred door; this clearnet fallback is tried only when the onion is unreachable, and any explicit --clearnet-server / clearnet_url / Settings value still wins over it.

Client-only change; the relay is unaffected. Clients must be ≥ 1.1.4 to use the relay (auth is enforced).