fix(windows): improve Windows build setup and DLL handling

- Add .exe extension to target-suffixed daemon binary on Windows
- Auto-copy DLLs from apps/.deps/bin to target/debug and target/release
- Add PATH env var for Windows in dev-with-daemon.ts so daemon finds DLLs
- Run cargo xtask setup automatically at end of setup.ps1

These changes fix DLL_NOT_FOUND errors when running the Tauri app or
daemon on Windows by ensuring native dependency DLLs are discoverable.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

scripts/setup.ps1

@@ -256,6 +256,17 @@ if ($LASTEXITCODE -ne 0) {
     Exit-WithError "Something went wrong, exit code: $LASTEXITCODE"
 }
 
+# Run xtask setup to download native dependencies and configure cargo
+if (-not $env:CI) {
+    Write-Host
+    Write-Host 'Running cargo xtask setup to download native dependencies...' -ForegroundColor Yellow
+    Set-Location $projectRoot
+    cargo xtask setup
+    if ($LASTEXITCODE -ne 0) {
+        Exit-WithError 'Failed to run cargo xtask setup'
+    }
+}
+
 if (-not $env:CI) {
     Write-Host
     Write-Host 'Your machine has been setup for Spacedrive development!' -ForegroundColor Green