v0.0.47: integrate 6 WZP audio variants into featherChat calls

startAudio() now dynamically loads the selected WZP client variant:
- /audio-variant [pure|hybrid|full|ws|ws-fec|ws-full]
- Loads variant JS from wzp-web's /audio/js/ path via Caddy
- Falls back to inline pure implementation if variant fails to load
- Variant persisted in localStorage across sessions
- Call bar shows active variant: "In call [ws-fec] with 0x..."

Variants:
  pure     — raw PCM over WS (bridge needed, no WASM)
  hybrid   — raw PCM + WASM FEC over WS (bridge needed)
  full     — WebTransport + FEC + crypto (no bridge, future)
  ws       — WZP protocol over WS (relay direct)
  ws-fec   — WZP + WASM FEC over WS (relay direct)
  ws-full  — WZP + FEC + E2E crypto over WS (relay direct)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

warzone/crates/warzone-protocol/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "warzone-protocol"
-version = "0.0.46"
+version = "0.0.47"
 edition = "2021"
 license = "MIT"
 description = "Core crypto & wire protocol for featherChat (Warzone messenger)"