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/pkg/runtime/draganddrop.go

@@ -0,0 +1,37 @@
+package runtime
+
+import (
+	"context"
+	"fmt"
+)
+
+// OnFileDrop returns a slice of file path strings when a drop is finished.
+func OnFileDrop(ctx context.Context, callback func(x, y int, paths []string)) {
+	if callback == nil {
+		LogError(ctx, "OnFileDrop called with a nil callback")
+		return
+	}
+	EventsOn(ctx, "wails:file-drop", func(optionalData ...interface{}) {
+		if len(optionalData) != 3 {
+			callback(0, 0, nil)
+		}
+		x, ok := optionalData[0].(int)
+		if !ok {
+			LogError(ctx, fmt.Sprintf("invalid x coordinate in drag and drop: %v", optionalData[0]))
+		}
+		y, ok := optionalData[1].(int)
+		if !ok {
+			LogError(ctx, fmt.Sprintf("invalid y coordinate in drag and drop: %v", optionalData[1]))
+		}
+		paths, ok := optionalData[2].([]string)
+		if !ok {
+			LogError(ctx, fmt.Sprintf("invalid path data in drag and drop: %v", optionalData[2]))
+		}
+		callback(x, y, paths)
+	})
+}
+
+// OnFileDropOff removes the drag and drop listeners and handlers.
+func OnFileDropOff(ctx context.Context) {
+	EventsOff(ctx, "wails:file-drop")
+}