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/wails/v2/internal/signal/signal.go

@@ -0,0 +1,38 @@
+package signal
+
+import (
+	"os"
+	gosignal "os/signal"
+	"sync"
+	"syscall"
+)
+
+var signalChannel = make(chan os.Signal, 2)
+
+var (
+	callbacks []func()
+	lock      sync.Mutex
+)
+
+func OnShutdown(callback func()) {
+	lock.Lock()
+	defer lock.Unlock()
+	callbacks = append(callbacks, callback)
+}
+
+// Start the Signal Manager
+func Start() {
+	// Hook into interrupts
+	gosignal.Notify(signalChannel, os.Interrupt, syscall.SIGTERM, syscall.SIGINT)
+
+	// Spin off signal listener and wait for either a cancellation
+	// or signal
+	go func() {
+		<-signalChannel
+		println("")
+		println("Ctrl+C detected. Shutting down...")
+		for _, callback := range callbacks {
+			callback()
+		}
+	}()
+}