diff --git a/start-aivideo.bat b/start-aivideo.bat
index 4a29a00..ff5173a 100644
--- a/start-aivideo.bat
+++ b/start-aivideo.bat
@@ -2,37 +2,12 @@
 setlocal
 
 set "ROOT=%~dp0"
+set "BACKEND_DIR=%ROOT%backend"
+set "VENV_PYTHON=%BACKEND_DIR%\.venv\Scripts\python.exe"
+set "SOURCE_BACKEND_ENV=set DATABASE_URL=sqlite:///./aivideo.sqlite3 && set CELERY_TASK_ALWAYS_EAGER=true && set STORAGE_PROVIDER=local && set LOCAL_STORAGE_PATH=storage_data && set STORAGE_PUBLIC_BASE_URL=http://127.0.0.1:8000/storage"
 cd /d "%ROOT%"
 
-echo [1/6] Checking Docker...
-set "DOCKER_EXE="
-set "DOCKER_DESKTOP_EXE="
-call :resolve_docker
-
-if not defined DOCKER_EXE (
-  echo Docker CLI was not found.
-  echo Install Docker Desktop, or add docker.exe to PATH, then rerun this script.
-  pause
-  exit /b 1
-)
-
-call :ensure_docker_ready
-if errorlevel 1 exit /b 1
-
-echo [2/6] Starting mysql, redis and minio...
-call "%DOCKER_EXE%" compose up -d mysql redis minio
-if errorlevel 1 (
-  echo Failed to start docker services.
-  pause
-  exit /b 1
-)
-
-if not exist "%ROOT%backend\.env" (
-  echo Missing backend\.env
-  pause
-  exit /b 1
-)
-
+echo [1/6] Checking Python...
 set "PYTHON_CMD="
 where py >nul 2>nul
 if not errorlevel 1 set "PYTHON_CMD=py -3"
@@ -48,24 +23,42 @@ if not defined PYTHON_CMD (
   exit /b 1
 )
 
-if not exist "%ROOT%backend\.venv\Scripts\python.exe" (
-  echo [3/6] Creating backend virtual environment...
-  call %PYTHON_CMD% -m venv "%ROOT%backend\.venv"
+echo [2/6] Checking npm...
+where npm >nul 2>nul
+if errorlevel 1 (
+  echo npm was not found in PATH.
+  echo Install Node.js, then rerun this script.
+  pause
+  exit /b 1
+)
+
+echo [3/6] Checking backend environment...
+if exist "%BACKEND_DIR%\.env" (
+  echo Found backend\.env.
+  echo Source mode will still prefer local SQLite and local storage for one-click startup.
+) else (
+  echo backend\.env was not found.
+  echo The backend will start with built-in defaults ^(SQLite, local storage, mock task flow^).
+)
+
+if not exist "%VENV_PYTHON%" (
+  echo [4/6] Creating backend virtual environment...
+  call %PYTHON_CMD% -m venv "%BACKEND_DIR%\.venv"
   if errorlevel 1 (
     echo Failed to create backend virtual environment.
     pause
     exit /b 1
   )
 
-  echo [4/6] Installing backend dependencies...
-  call "%ROOT%backend\.venv\Scripts\python.exe" -m pip install --disable-pip-version-check -r "%ROOT%backend\requirements.txt"
+  echo Installing backend dependencies...
+  call "%VENV_PYTHON%" -m pip install --disable-pip-version-check -r "%BACKEND_DIR%\requirements.txt"
   if errorlevel 1 (
     echo Failed to install backend dependencies.
     pause
     exit /b 1
   )
 ) else (
-  echo [3/6] Backend virtual environment already exists.
+  echo [4/6] Backend virtual environment already exists.
 )
 
 if not exist "%ROOT%node_modules" (
@@ -81,7 +74,7 @@ if not exist "%ROOT%node_modules" (
 )
 
 echo [6/6] Starting backend and unified frontend...
-start "AIVideo Backend" cmd /k "cd /d ""%ROOT%backend"" && ""%ROOT%backend\.venv\Scripts\python.exe"" -m uvicorn app.main:app --reload --host 0.0.0.0 --port 8000"
+start "AIVideo Backend" cmd /k "cd /d ""%BACKEND_DIR%"" && %SOURCE_BACKEND_ENV% && ""%VENV_PYTHON%"" -m uvicorn app.main:app --reload --host 0.0.0.0 --port 8000"
 start "AIVideo Frontend" cmd /k "cd /d ""%ROOT%"" && npm run dev"
 
 echo.
@@ -91,73 +84,3 @@ echo API:       http://localhost:8000
 echo.
 echo Two windows have been opened for backend and frontend.
 pause
-goto :eof
-
-:resolve_docker
-for /f "delims=" %%I in ('where docker 2^>nul') do (
-  if not defined DOCKER_EXE set "DOCKER_EXE=%%~fI"
-)
-
-if defined DOCKER_EXE goto resolve_desktop
-
-for %%I in (
-  "%ProgramFiles%\Docker\Docker\resources\bin\docker.exe"
-  "%ProgramFiles%\Docker\Docker\resources\bin\com.docker.cli.exe"
-  "%ProgramW6432%\Docker\Docker\resources\bin\docker.exe"
-  "%ProgramW6432%\Docker\Docker\resources\bin\com.docker.cli.exe"
-  "%LocalAppData%\Programs\Docker\Docker\resources\bin\docker.exe"
-  "%LocalAppData%\Programs\Docker\Docker\resources\bin\com.docker.cli.exe"
-) do (
-  if exist "%%~fI" (
-    set "DOCKER_EXE=%%~fI"
-    goto resolve_desktop
-  )
-)
-
-:resolve_desktop
-for %%I in (
-  "%ProgramFiles%\Docker\Docker\Docker Desktop.exe"
-  "%ProgramW6432%\Docker\Docker\Docker Desktop.exe"
-  "%LocalAppData%\Programs\Docker\Docker\Docker Desktop.exe"
-) do (
-  if exist "%%~fI" (
-    set "DOCKER_DESKTOP_EXE=%%~fI"
-    goto :eof
-  )
-)
-
-goto :eof
-
-:ensure_docker_ready
-call "%DOCKER_EXE%" info >nul 2>nul
-if not errorlevel 1 exit /b 0
-
-if defined DOCKER_DESKTOP_EXE (
-  echo Docker Desktop is installed but not ready. Starting it now...
-  start "" "%DOCKER_DESKTOP_EXE%"
-  call :wait_for_docker 60
-  if not errorlevel 1 exit /b 0
-
-  echo Docker Desktop did not become ready in time.
-  echo Wait for Docker Desktop to finish starting, then rerun this script.
-  pause
-  exit /b 1
-)
-
-echo Docker CLI was found, but the Docker engine is not ready.
-echo Start Docker Desktop or Docker Engine, then rerun this script.
-pause
-exit /b 1
-
-:wait_for_docker
-set "DOCKER_WAIT_REMAINING=%~1"
-if not defined DOCKER_WAIT_REMAINING set "DOCKER_WAIT_REMAINING=60"
-
-:wait_for_docker_loop
-call "%DOCKER_EXE%" info >nul 2>nul
-if not errorlevel 1 exit /b 0
-if %DOCKER_WAIT_REMAINING% LEQ 0 exit /b 1
-
-timeout /t 2 /nobreak >nul
-set /a DOCKER_WAIT_REMAINING-=2
-goto wait_for_docker_loop