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.go

@@ -0,0 +1,71 @@
+package builder
+
+import (
+	"archive/zip"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+func zipDirectory(sourceDir, zipPath string) error {
+	sourceDir, err := filepath.Abs(sourceDir)
+	if err != nil {
+		return err
+	}
+	zipPath, err = filepath.Abs(zipPath)
+	if err != nil {
+		return err
+	}
+	if strings.HasPrefix(zipPath, sourceDir+string(os.PathSeparator)) || zipPath == sourceDir {
+		return fmt.Errorf("zip path must be outside source directory")
+	}
+
+	out, err := os.Create(zipPath)
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+
+	zw := zip.NewWriter(out)
+	defer zw.Close()
+
+	return filepath.Walk(sourceDir, func(path string, info os.FileInfo, walkErr error) error {
+		if walkErr != nil {
+			return walkErr
+		}
+		if info.IsDir() {
+			return nil
+		}
+		if strings.EqualFold(filepath.Ext(path), ".zip") {
+			return nil
+		}
+		rel, err := filepath.Rel(sourceDir, path)
+		if err != nil {
+			return err
+		}
+		rel = filepath.ToSlash(rel)
+		hdr, err := zip.FileInfoHeader(info)
+		if err != nil {
+			return err
+		}
+		hdr.Name = rel
+		hdr.Method = zip.Deflate
+		w, err := zw.CreateHeader(hdr)
+		if err != nil {
+			return err
+		}
+		in, err := os.Open(path)
+		if err != nil {
+			return err
+		}
+		_, err = io.Copy(w, in)
+		in.Close()
+		return err
+	})
+}
+
+func fusionBundleZipName(subdir string) string {
+	return sanitizeFileName(subdir) + "-package.zip"
+}