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/git.sr.ht/~jackmordaunt/go-toast/v2/wintoast/procs.go

@@ -0,0 +1,37 @@
+//go:build windows
+
+package wintoast
+
+import (
+	"unsafe"
+
+	"github.com/go-ole/go-ole"
+	"golang.org/x/sys/windows"
+)
+
+var (
+	// Define procs that go-ole doesn't provide. This is how we register our Go-implemented
+	// COM objects.
+	modcombase              = windows.NewLazySystemDLL("combase.dll")
+	procRegisterClassObject = modcombase.NewProc("CoRegisterClassObject")
+)
+
+// registerClassFactory teaches the Windows Runtime about our factory that can allocate
+// instances of our ActivationCallback.
+func registerClassFactory(factory *IClassFactory) error {
+	// cookie is used as a handle to this class. It is used when calling CoRevokeClassObject
+	// which unregisters the class. We don't need it until we plan to revoke this registration
+	// for some reason.
+	var cookie int64
+	hr, _, _ := procRegisterClassObject.Call(
+		uintptr(unsafe.Pointer(GUID_ImplNotificationActivationCallback)),
+		uintptr(unsafe.Pointer(factory)),
+		uintptr(ole.CLSCTX_LOCAL_SERVER),
+		uintptr(1), /* REGCLS_MULTIPLEUSE */
+		uintptr(unsafe.Pointer(&cookie)),
+	)
+	if hr != ole.S_OK {
+		return ole.NewError(hr)
+	}
+	return nil
+}