Merge kiosk-hdmi-audio-fix: PipeWire env, in-process-gpu, asound.conf tracking

Conflict resolution: keep the branch's CPUQuota=200% (75% was the proven
cause of choppy HDMI audio — the file's own comment says so; the 75% on main
was an accidental regression bundled into an unrelated UI commit) and keep
main's newer MemoryMax=2800M/MemoryHigh=2200M tuning.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

scripts/deploy-tailscale.sh

@@ -425,6 +425,22 @@ deploy_node() {
         ' 2>/dev/null || true
     fi
 
+    # ── Deploy ALSA default-device config ────────────────────────────
+    ASOUND_CONF="$PROJECT_DIR/image-recipe/configs/asound.conf"
+    if [ -f "$ASOUND_CONF" ]; then
+        step "Deploying ALSA default-device config"
+        scp $SSH_OPTS "$ASOUND_CONF" "$TARGET:/tmp/asound.conf" 2>/dev/null || true
+        ssh $SSH_OPTS "$TARGET" '
+            if ! diff -q /tmp/asound.conf /etc/asound.conf >/dev/null 2>&1; then
+                sudo cp /tmp/asound.conf /etc/asound.conf
+                echo "   Installed"
+            else
+                echo "   Unchanged"
+            fi
+            rm -f /tmp/asound.conf
+        ' 2>/dev/null || true
+    fi
+
     # ── Step 18: NTP + swap ──────────────────────────────────────────
     step "Ensuring NTP + swap"
     ssh $SSH_OPTS "$TARGET" '