chore: scaffold Phase 0 - Tauri2 + Rust + React + llama.cpp integration

scripts/download-test-model.ps1

@@ -0,0 +1,23 @@
+param(
+    [string]$Endpoint = "https://hf-mirror.com",
+    [string]$OutDir = ""
+)
+
+$ErrorActionPreference = "Stop"
+
+if (-not $OutDir) {
+    $OutDir = Join-Path $env:APPDATA "XianrenStudio\models"
+}
+New-Item -ItemType Directory -Force -Path $OutDir | Out-Null
+
+$modelPath = "Qwen/Qwen2.5-0.5B-Instruct-GGUF/resolve/main/qwen2.5-0.5b-instruct-q4_k_m.gguf"
+$url = "$Endpoint/$modelPath"
+$outFile = Join-Path $OutDir "qwen2.5-0.5b-instruct-q4_k_m.gguf"
+
+Write-Host "Downloading $url"
+Write-Host "-> $outFile"
+curl.exe -L --fail --progress-bar -o $outFile $url
+if ($LASTEXITCODE -ne 0) {
+    throw "download failed with exit code $LASTEXITCODE"
+}
+Write-Host "Done."