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/tkrajina/go-reflector/reflector/walk.go

@@ -0,0 +1,10 @@
+package reflector
+
+import "reflect"
+
+func Walk(i interface{}, f func(i2 interface{})) {
+	ty := reflect.TypeOf(i)
+	if ty.Kind() == reflect.Ptr {
+		ty = ty.Elem()
+	}
+}