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/chromium_386.go

@@ -0,0 +1,28 @@
+//go:build windows
+// +build windows
+
+package edge
+
+import (
+	"github.com/wailsapp/go-webview2/internal/w32"
+	"golang.org/x/sys/windows"
+	"unsafe"
+)
+
+func (e *Chromium) SetSize(bounds w32.Rect) {
+	if e.controller == nil {
+		return
+	}
+
+	hr, _, _ := e.controller.vtbl.PutBounds.Call(
+		uintptr(unsafe.Pointer(e.controller)),
+		uintptr(bounds.Left),
+		uintptr(bounds.Top),
+		uintptr(bounds.Right),
+		uintptr(bounds.Bottom),
+	)
+
+	if windows.Handle(hr) != windows.S_OK {
+		e.errorCallback(windows.Errno(hr))
+	}
+}