fix: restore automatic startup of local ADB server

scripts/start.ps1

@@ -126,12 +126,23 @@ function Update-EnvironmentPath {
 
 function Start-LocalAdbServer {
     if (Test-CommandExists "adb") {
+        $adbErrorPreference = $ErrorActionPreference
         try {
-            $origSocket = $env:ADB_SERVER_SOCKET
-            Remove-Item Env:\ADB_SERVER_SOCKET -ErrorAction SilentlyContinue
-            & adb start-server 2>$null | Out-Null
-            if ($origSocket) { $env:ADB_SERVER_SOCKET = $origSocket }
-        } catch {}
+            # Windows PowerShell 5.1 wraps native stderr in ErrorRecord objects.
+            # ADB prints normal daemon-start messages there, so inspect its exit code.
+            $ErrorActionPreference = "Continue"
+            # Explicit options ignore inherited remote-server environment settings.
+            $adbOutput = & adb -H localhost -P 5037 start-server 2>&1
+            if ($LASTEXITCODE -ne 0) {
+                Write-Host "   [警告] 本机 ADB 服务启动失败（退出码 $LASTEXITCODE）。" -ForegroundColor Yellow
+                Write-Host ($adbOutput | Out-String).Trim() -ForegroundColor Yellow
+                Write-Host "   [操作] 请检查 ADB 安装、端口占用或安全软件拦截；本机设备暂不可用。" -ForegroundColor Yellow
+            }
+        } catch {
+            Write-Host "   [警告] 本机 ADB 服务启动异常：$_" -ForegroundColor Yellow
+        } finally {
+            $ErrorActionPreference = $adbErrorPreference
+        }
     }
 }