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/internal/wv2installer/browser.go

@@ -0,0 +1,25 @@
+//go:build windows && wv2runtime.browser
+// +build windows,wv2runtime.browser
+
+package wv2installer
+
+import (
+	"fmt"
+	"github.com/wailsapp/wails/v2/internal/webview2runtime"
+	"github.com/wailsapp/wails/v2/pkg/options/windows"
+)
+
+func doInstallationStrategy(installStatus installationStatus, messages *windows.Messages) error {
+	confirmed, err := webview2runtime.Confirm(messages.DownloadPage+MinimumRuntimeVersion, messages.MissingRequirements)
+	if err != nil {
+		return err
+	}
+	if confirmed {
+		err = webview2runtime.OpenInstallerDownloadWebpage()
+		if err != nil {
+			return err
+		}
+	}
+
+	return fmt.Errorf(messages.FailedToInstall)
+}