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/go-webview2/pkg/edge/IStream.go

@@ -0,0 +1,66 @@
+//go:build windows
+
+package edge
+
+import (
+	"errors"
+	"io"
+	"syscall"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+)
+
+type _IStreamVtbl struct {
+	_IUnknownVtbl
+	Read  ComProc
+	Write ComProc
+}
+
+type IStream struct {
+	vtbl *_IStreamVtbl
+}
+
+func (i *IStream) AddRef() error {
+	_, _, err := i.vtbl.AddRef.Call(uintptr(unsafe.Pointer(i)))
+	if err != nil && !errors.Is(err, windows.ERROR_SUCCESS) {
+		return err
+	}
+
+	return nil
+}
+
+func (i *IStream) Release() error {
+	_, _, err := i.vtbl.Release.Call(uintptr(unsafe.Pointer(i)))
+	if err != nil && !errors.Is(err, windows.ERROR_SUCCESS) {
+		return err
+	}
+
+	return nil
+}
+
+func (i *IStream) Read(p []byte) (int, error) {
+	bufLen := len(p)
+	if bufLen == 0 {
+		return 0, nil
+	}
+
+	var n int
+	hr, _, _ := i.vtbl.Read.Call(
+		uintptr(unsafe.Pointer(i)),
+		uintptr(unsafe.Pointer(&p[0])),
+		uintptr(bufLen),
+		uintptr(unsafe.Pointer(&n)),
+	)
+
+	switch windows.Handle(hr) {
+	case windows.S_OK:
+		// The buffer has been completely filled
+		return n, nil
+	case windows.S_FALSE:
+		// The buffer has been filled with less than len data and the stream is EOF
+		return n, io.EOF
+	default:
+		return 0, syscall.Errno(hr)
+	}
+}