feat: Music Assistant, Claude primary LLM, model tag in chat, setup.sh rewrite

- Deploy Music Assistant on Pi (10.0.0.199:8095) with host networking for
  Chromecast mDNS discovery, Spotify + SMB library support
- Switch primary LLM from Ollama to Claude Sonnet 4 (Anthropic API),
  local models remain as fallback
- Add model info tag under each assistant message in dashboard chat,
  persisted in conversation JSON
- Rewrite homeai-agent/setup.sh: loads .env, injects API keys into plists,
  symlinks plists to ~/Library/LaunchAgents/, smoke tests services
- Update install_service() in common.sh to use symlinks instead of copies
- Open UFW ports on Pi for Music Assistant (8095, 8097, 8927)
- Add ANTHROPIC_API_KEY to openclaw + bridge launchd plists

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/common.sh

@@ -228,11 +228,19 @@ install_service() {
       log_warn "No launchd plist at $launchd_file — skipping service install."
       return
     fi
-    local plist_dest="${HOME}/Library/LaunchAgents/$(basename "$launchd_file")"
+    local plist_name
+    plist_name="$(basename "$launchd_file")"
+    local plist_dest="${HOME}/Library/LaunchAgents/${plist_name}"
+    local plist_label="${plist_name%.plist}"
+    local abs_source
+    abs_source="$(cd "$(dirname "$launchd_file")" && pwd)/$(basename "$launchd_file")"
     log_step "Installing launchd agent: $name"
-    cp "$launchd_file" "$plist_dest"
-    launchctl load -w "$plist_dest"
-    log_success "LaunchAgent '$name' installed and loaded."
+    # Unload existing service if running
+    launchctl bootout "gui/$(id -u)/${plist_label}" 2>/dev/null || true
+    # Symlink so edits to repo source take effect on reload
+    ln -sf "$abs_source" "$plist_dest"
+    launchctl bootstrap "gui/$(id -u)" "$plist_dest"
+    log_success "LaunchAgent '$name' symlinked and loaded."
   fi
 }