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/native_module_arm64.go

@@ -0,0 +1,8 @@
+//go:build windows && native_webview2loader
+
+package webviewloader
+
+import _ "embed"
+
+//go:embed arm64/WebView2Loader.dll
+var WebView2Loader []byte