Switch remote deploy to vendored source builds

Move remote deployment to a vendored source bundle built on the target host via Docker so redeploys no longer require local cross-compilation or host Go installation.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

vendor/github.com/wailsapp/wails/v2/pkg/runtime/screen.go

@@ -0,0 +1,15 @@
+package runtime
+
+import (
+	"context"
+
+	"github.com/wailsapp/wails/v2/internal/frontend"
+)
+
+type Screen = frontend.Screen
+
+// ScreenGetAll returns all screens
+func ScreenGetAll(ctx context.Context) ([]Screen, error) {
+	appFrontend := getFrontend(ctx)
+	return appFrontend.ScreenGetAll()
+}