Add one-command install script and stability fixes

- Add install.sh for automated setup
- Add all component files (wrapper, service, config, verify)
- Add stability fixes section (WiFi PowerSave disable + Watchdog)
- Update README with new installation instructions

03-darkice-wrapper.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+MAX_WAIT_SEC=90
+SLEEP_STEP=2
+DARKICE_CMD="/usr/bin/darkice -c /home/pi/darkice.cfg"
+
+log() { echo "[$(date '+%H:%M:%S')] $*" >&2; }
+
+log "⏳ Waiting for ALSA card 0 (USB audio)..."
+
+elapsed=0
+while ! arecord -l 2>/dev/null | grep -q "^card 0:"; do
+  if (( elapsed >= MAX_WAIT_SEC )); then
+    log "💥 FATAL: No card 0 after ${MAX_WAIT_SEC}s"
+    arecord -l || true
+    exit 1
+  fi
+  sleep "${SLEEP_STEP}"
+  elapsed=$((elapsed + SLEEP_STEP))
+done
+
+log "✅ Card 0 ready! Launching DarkIce."
+exec ${DARKICE_CMD}