chore: Add Atomizer launcher and utility scripts

- atomizer.ico: Application icon
- launch_atomizer.bat: One-click launcher for dashboard
- create_desktop_shortcut.ps1: Desktop shortcut creator
- restart_backend.bat, start_backend_8002.bat: Dev utilities

tools/launch_atomizer.bat

@@ -0,0 +1,65 @@
+@echo off
+REM ============================================================
+REM Atomizer Dashboard Launcher
+REM One-click: starts servers and opens dashboard in browser
+REM ============================================================
+
+title Atomizer
+cd /d "%~dp0\.."
+
+REM Ports (match vite.config.ts)
+set BACKEND_PORT=8001
+set FRONTEND_PORT=3003
+set URL=http://localhost:%FRONTEND_PORT%
+
+REM Check if already running
+set BACKEND_RUNNING=0
+set FRONTEND_RUNNING=0
+
+netstat -ano | findstr "LISTENING" | findstr ":%BACKEND_PORT% " > nul 2>&1
+if %errorlevel% equ 0 set BACKEND_RUNNING=1
+
+netstat -ano | findstr "LISTENING" | findstr ":%FRONTEND_PORT% " > nul 2>&1
+if %errorlevel% equ 0 set FRONTEND_RUNNING=1
+
+REM If both running, just open browser and exit immediately
+if %BACKEND_RUNNING% equ 1 (
+    if %FRONTEND_RUNNING% equ 1 (
+        start "" %URL%
+        exit
+    )
+)
+
+REM Show brief splash while starting
+echo.
+echo   Starting Atomizer Dashboard...
+echo.
+
+REM Start backend (hidden window)
+if %BACKEND_RUNNING% equ 0 (
+    echo   [1/2] Backend...
+    start /min "Atomizer Backend" cmd /c "cd /d %~dp0\..\atomizer-dashboard\backend && C:\Users\antoi\anaconda3\envs\atomizer\python.exe -m uvicorn api.main:app --host 0.0.0.0 --port %BACKEND_PORT%"
+)
+
+REM Start frontend (hidden window)
+if %FRONTEND_RUNNING% equ 0 (
+    echo   [2/2] Frontend...
+    start /min "Atomizer Frontend" cmd /c "cd /d %~dp0\..\atomizer-dashboard\frontend && npm run dev"
+)
+
+REM Wait for frontend to be ready (poll until port responds)
+echo.
+echo   Waiting for servers to start...
+:WAIT_LOOP
+timeout /t 1 /nobreak > nul
+netstat -ano | findstr "LISTENING" | findstr ":%FRONTEND_PORT% " > nul 2>&1
+if %errorlevel% neq 0 goto WAIT_LOOP
+
+REM Small extra delay to ensure Vite is fully ready
+timeout /t 2 /nobreak > nul
+
+REM Open browser
+start "" %URL%
+
+REM Close this launcher window
+exit