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/samber/lo/constraints.go

@@ -0,0 +1,6 @@
+package lo
+
+// Clonable defines a constraint of types having Clone() T method.
+type Clonable[T any] interface {
+	Clone() T
+}