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/bep/debounce/debounce.go

@@ -0,0 +1,43 @@
+// Copyright © 2019 Bjørn Erik Pedersen <bjorn.erik.pedersen@gmail.com>.
+//
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
+// Package debounce provides a debouncer func. The most typical use case would be
+// the user typing a text into a form; the UI needs an update, but let's wait for
+// a break.
+package debounce
+
+import (
+	"sync"
+	"time"
+)
+
+// New returns a debounced function that takes another functions as its argument.
+// This function will be called when the debounced function stops being called
+// for the given duration.
+// The debounced function can be invoked with different functions, if needed,
+// the last one will win.
+func New(after time.Duration) func(f func()) {
+	d := &debouncer{after: after}
+
+	return func(f func()) {
+		d.add(f)
+	}
+}
+
+type debouncer struct {
+	mu    sync.Mutex
+	after time.Duration
+	timer *time.Timer
+}
+
+func (d *debouncer) add(f func()) {
+	d.mu.Lock()
+	defer d.mu.Unlock()
+
+	if d.timer != nil {
+		d.timer.Stop()
+	}
+	d.timer = time.AfterFunc(d.after, f)
+}