Initial lip-sync service with command backend

scripts/start.ps1

@@ -0,0 +1,27 @@
+param(
+    [int]$Port = 7860,
+    [string]$HostName = "0.0.0.0",
+    [ValidateSet("ffmpeg_mux", "command", "copy_video")]
+    [string]$Backend = "ffmpeg_mux",
+    [switch]$Install
+)
+
+$ErrorActionPreference = "Stop"
+$Root = Resolve-Path -LiteralPath (Join-Path $PSScriptRoot "..")
+Set-Location $Root
+
+$Uv = Get-Command uv -ErrorAction SilentlyContinue
+if (-not $Uv) {
+    throw "uv is required. Install it first: https://docs.astral.sh/uv/getting-started/installation/"
+}
+
+if ($Install) {
+    & $Uv.Source sync
+}
+
+$env:LIPSYNC_HOST = $HostName
+$env:LIPSYNC_PORT = "$Port"
+$env:LIPSYNC_BACKEND = $Backend
+$env:PYTHONPATH = (Join-Path $Root "src")
+
+& $Uv.Source run python -m digital_human_lipsync_service