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/combridge/syscall.go

@@ -0,0 +1,39 @@
+//go:build windows
+
+package combridge
+
+import (
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+)
+
+var (
+	modkernel32     = windows.NewLazySystemDLL("kernel32.dll")
+	procGlobalAlloc = modkernel32.NewProc("GlobalAlloc")
+	procGlobalFree  = modkernel32.NewProc("GlobalFree")
+
+	uintptrSize = unsafe.Sizeof(uintptr(0))
+)
+
+func allocUintptrObject(size int) (uintptr, []uintptr) {
+	v := globalAlloc(uintptr(size) * uintptrSize)
+	slice := unsafe.Slice((*uintptr)(unsafe.Pointer(v)), size)
+	return v, slice
+}
+
+func globalAlloc(dwBytes uintptr) uintptr {
+	ret, _, _ := procGlobalAlloc.Call(uintptr(0), dwBytes)
+	if ret == 0 {
+		panic("globalAlloc failed")
+	}
+
+	return ret
+}
+
+func globalFree(data uintptr) {
+	ret, _, _ := procGlobalFree.Call(data)
+	if ret != 0 {
+		panic("globalFree failed")
+	}
+}