implement backend service manager and speech transcription pipeline with supporting setup scripts

mac.sh

@@ -188,6 +188,7 @@ echo "   Running!"
 echo "   Web UI:     http://localhost:${FRONTEND_PORT}"
 echo "   GPU API:    Auto-selected by the app (starts at 8080)"
 echo "   Text API:   Starts when a GGUF model is loaded (port ${LLM_PORT})"
+echo "   Speech:     Available when a whisper.cpp binary is present"
 echo ""
 echo "   Press Ctrl+C in this window to stop all services."
 echo "  ============================================================"