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/Cargo.lock

@@ -2956,7 +2956,7 @@ dependencies = [
 
 [[package]]
 name = "warzone-client"
-version = "0.0.46"
+version = "0.0.47"
 dependencies = [
  "anyhow",
  "argon2",
@@ -2989,7 +2989,7 @@ dependencies = [
 
 [[package]]
 name = "warzone-mule"
-version = "0.0.46"
+version = "0.0.47"
 dependencies = [
  "anyhow",
  "clap",
@@ -2998,7 +2998,7 @@ dependencies = [
 
 [[package]]
 name = "warzone-protocol"
-version = "0.0.46"
+version = "0.0.47"
 dependencies = [
  "base64",
  "bincode",
@@ -3023,7 +3023,7 @@ dependencies = [
 
 [[package]]
 name = "warzone-server"
-version = "0.0.46"
+version = "0.0.47"
 dependencies = [
  "anyhow",
  "axum",
@@ -3054,7 +3054,7 @@ dependencies = [
 
 [[package]]
 name = "warzone-wasm"
-version = "0.0.46"
+version = "0.0.47"
 dependencies = [
  "base64",
  "bincode",