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/webviewloader/find_dll.go

@@ -0,0 +1,74 @@
+//go:build windows
+
+package webviewloader
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"runtime"
+
+	"golang.org/x/sys/windows/registry"
+)
+
+var (
+	errNoClientDLLFound = errors.New("no webview2 found")
+)
+
+func findEmbeddedBrowserVersion(filename string) (string, error) {
+	block, err := getFileVersionInfo(filename)
+	if err != nil {
+		return "", err
+	}
+
+	info, err := verQueryValueString(block, "\\StringFileInfo\\040904B0\\ProductVersion")
+	if err != nil {
+		return "", err
+	}
+
+	return info, nil
+}
+
+func findEmbeddedClientDll(embeddedEdgeSubFolder string) (outClientPath string, err error) {
+	if !filepath.IsAbs(embeddedEdgeSubFolder) {
+		exe, err := os.Executable()
+		if err != nil {
+			return "", err
+		}
+
+		embeddedEdgeSubFolder = filepath.Join(filepath.Dir(exe), embeddedEdgeSubFolder)
+	}
+
+	return findClientDllInFolder(embeddedEdgeSubFolder)
+}
+
+func findClientDllInFolder(folder string) (string, error) {
+	arch := ""
+	switch runtime.GOARCH {
+	case "arm64":
+		arch = "arm64"
+	case "amd64":
+		arch = "x64"
+	case "386":
+		arch = "x86"
+	default:
+		return "", fmt.Errorf("Unsupported architecture")
+	}
+
+	dllPath := filepath.Join(folder, "EBWebView", arch, "EmbeddedBrowserWebView.dll")
+	if _, err := os.Stat(dllPath); err != nil {
+		return "", mapFindErr(err)
+	}
+	return dllPath, nil
+}
+
+func mapFindErr(err error) error {
+	if errors.Is(err, registry.ErrNotExist) {
+		return errNoClientDLLFound
+	}
+	if errors.Is(err, os.ErrNotExist) {
+		return errNoClientDLLFound
+	}
+	return err
+}