Add movie fusion packages with locked media, ZIP export, and batch forge UI.

Paired video mode encrypts movies, uses runner-only lock hints, bundles README plus artifacts per title, and supports batch forging with progress.

server/internal/builder/fusion_zip_test.go

@@ -0,0 +1,27 @@
+package builder
+
+import (
+	"archive/zip"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestZipDirectory(t *testing.T) {
+	dir := t.TempDir()
+	if err := os.WriteFile(filepath.Join(dir, "README.txt"), []byte("hi"), 0644); err != nil {
+		t.Fatal(err)
+	}
+	zipPath := filepath.Join(t.TempDir(), "pkg.zip")
+	if err := zipDirectory(dir, zipPath); err != nil {
+		t.Fatal(err)
+	}
+	r, err := zip.OpenReader(zipPath)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer r.Close()
+	if len(r.File) != 1 || r.File[0].Name != "README.txt" {
+		t.Fatalf("unexpected zip contents: %+v", r.File)
+	}
+}