Revert "feat(multimodal): 补齐阶段F运行管理与收尾验收"

This reverts commit 64f63ff1bd.

backend/scripts/install-model-runtime.ps1

@@ -1,10 +1,9 @@
 param(
-    [ValidateSet('cpu', 'cuda')][string]$Device = 'cpu',
-    [string]$RuntimeDirectory = ''
+    [ValidateSet('cpu', 'cuda')][string]$Device = 'cpu'
 )
 $ErrorActionPreference = 'Stop'
 $backendRoot = Split-Path $PSScriptRoot -Parent
-$runtimeRoot = if ($RuntimeDirectory) { [IO.Path]::GetFullPath($RuntimeDirectory) } else { Join-Path $backendRoot '.venv-models' }
+$runtimeRoot = Join-Path $backendRoot '.venv-models'
 $runtimePython = Join-Path $runtimeRoot 'Scripts/python.exe'
 if (!(Test-Path -LiteralPath $runtimePython)) {
     & uv venv --python 3.12 $runtimeRoot
@@ -12,9 +11,7 @@ if (!(Test-Path -LiteralPath $runtimePython)) {
 }
 # CPU is the default. CUDA wheels include the runtime, not the NVIDIA driver.
 $torchIndex = if ($Device -eq 'cuda') { 'https://download.pytorch.org/whl/cu128' } else { 'https://download.pytorch.org/whl/cpu' }
-$wheelVariant = if ($Device -eq 'cuda') { 'cu128' } else { 'cpu' }
-# Pin the local version too: ==2.9.1 alone also accepts an already-installed CPU wheel.
-& uv pip install --python $runtimePython --index-url $torchIndex "torch==2.9.1+$wheelVariant" "torchaudio==2.9.1+$wheelVariant"
+& uv pip install --python $runtimePython --index-url $torchIndex 'torch==2.9.1' 'torchaudio==2.9.1'
 if ($LASTEXITCODE -ne 0) { throw 'PyTorch 安装失败' }
 & uv pip install --python $runtimePython -r (Join-Path $PSScriptRoot 'model-requirements.lock') -c (Join-Path $PSScriptRoot 'model-requirements.txt')
 if ($LASTEXITCODE -ne 0) { throw '模型依赖安装失败' }