ci(windows): self-heal missing flutter/windows before build

.gitea/workflows/build-windows.yml

@@ -183,24 +183,34 @@ jobs:
             exit 1
           fi
 
-      - name: Diagnose flutter/ contents before build
-        shell: pwsh
+      - name: Diagnose + restore flutter/windows if missing
+        shell: bash
         run: |
-          Write-Host "== pwd =="
-          Get-Location
-          Write-Host "`n== flutter/ ==" ; Get-ChildItem .\flutter -Force | Select-Object Mode,Length,Name
-          if (Test-Path .\flutter\windows) {
-            Write-Host "`n== flutter/windows/ =="
-            Get-ChildItem .\flutter\windows -Recurse -Force | Select-Object FullName, Length
-          } else {
-            Write-Host "`n!! flutter/windows DOES NOT EXIST !!"
-          }
-          Write-Host "`n== git ls-files flutter/windows =="
-          git ls-files flutter/windows | Measure-Object -Line
-          Write-Host "`n== git status (porcelain) =="
-          git status --porcelain | Select-Object -First 30
-          Write-Host "`n== flutter doctor =="
-          flutter doctor -v
+          echo "== pwd =="
+          pwd
+          echo
+          echo "== flutter/ (top level) =="
+          ls -la flutter/ 2>/dev/null || echo "flutter/ missing"
+          echo
+          if [ -d flutter/windows ]; then
+            echo "== flutter/windows/ exists, file count =="
+            find flutter/windows -type f | wc -l
+            ls -la flutter/windows/
+          else
+            echo "!! flutter/windows MISSING !!"
+            echo "git status (filtered to flutter/windows):"
+            git status --porcelain | grep -E "flutter/windows" | head -30 || echo "(no entries)"
+            echo
+            echo "Restoring flutter/windows from git index..."
+            git checkout HEAD -- flutter/windows
+            if [ -d flutter/windows ]; then
+              echo "Restored: $(find flutter/windows -type f | wc -l) files"
+            else
+              echo "RESTORE FAILED -- check git ls-files:"
+              git ls-files flutter/windows | head
+              exit 1
+            fi
+          fi
 
       - name: Build RustDesk (build.py --portable --hwcodec --flutter --vram)
         shell: pwsh