Refactor web build process and update documentation

- Removed Node.js build artifacts from .gitignore and adjusted Makefile to reflect changes in web UI build process, now using server-rendered Go templates instead of React.
- Updated README to clarify the new web UI architecture and output formats, emphasizing the removal of the Node.js build step.
- Added a command to set the number of frames per render task in manager configuration, enhancing user control over rendering settings.
- Improved Gitea workflow by removing unnecessary npm install step, streamlining the CI process.

internal/storage/storage.go

@@ -60,7 +60,7 @@ func (s *Storage) TempDir(pattern string) (string, error) {
 	if err := os.MkdirAll(s.tempPath(), 0755); err != nil {
 		return "", fmt.Errorf("failed to create temp directory: %w", err)
 	}
-	
+
 	// Create temp directory under storage base path
 	return os.MkdirTemp(s.tempPath(), pattern)
 }
@@ -166,12 +166,12 @@ func (s *Storage) GetFileSize(filePath string) (int64, error) {
 // Returns a list of all extracted file paths
 func (s *Storage) ExtractZip(zipPath, destDir string) ([]string, error) {
 	log.Printf("Extracting ZIP archive: %s -> %s", zipPath, destDir)
-	
+
 	// Ensure destination directory exists
 	if err := os.MkdirAll(destDir, 0755); err != nil {
 		return nil, fmt.Errorf("failed to create destination directory: %w", err)
 	}
-	
+
 	r, err := zip.OpenReader(zipPath)
 	if err != nil {
 		return nil, fmt.Errorf("failed to open ZIP file: %w", err)
@@ -187,7 +187,7 @@ func (s *Storage) ExtractZip(zipPath, destDir string) ([]string, error) {
 	for _, f := range r.File {
 		// Sanitize file path to prevent directory traversal
 		destPath := filepath.Join(destDir, f.Name)
-		
+
 		cleanDestPath := filepath.Clean(destPath)
 		cleanDestDir := filepath.Clean(destDir)
 		if !strings.HasPrefix(cleanDestPath, cleanDestDir+string(os.PathSeparator)) && cleanDestPath != cleanDestDir {
@@ -520,7 +520,7 @@ func (s *Storage) CreateJobContextFromDir(sourceDir string, jobID int64, exclude
 		if commonPrefix != "" && strings.HasPrefix(tarPath, commonPrefix) {
 			tarPath = strings.TrimPrefix(tarPath, commonPrefix)
 		}
-		
+
 		// Check if it's a .blend file at root (no path separators after prefix stripping)
 		if strings.HasSuffix(strings.ToLower(tarPath), ".blend") {
 			// Check if it's at root level (no directory separators)
@@ -566,7 +566,7 @@ func (s *Storage) CreateJobContextFromDir(sourceDir string, jobID int64, exclude
 			// Get relative path and strip common prefix if present
 			relPath := relPaths[i]
 			tarPath := filepath.ToSlash(relPath)
-			
+
 			// Strip common prefix if found
 			if commonPrefix != "" && strings.HasPrefix(tarPath, commonPrefix) {
 				tarPath = strings.TrimPrefix(tarPath, commonPrefix)
@@ -608,3 +608,129 @@ func (s *Storage) CreateJobContextFromDir(sourceDir string, jobID int64, exclude
 	return contextPath, nil
 }
 
+// CreateContextArchiveFromDirToPath creates a context archive from files in sourceDir at destPath.
+// This is used for pre-job upload sessions where the archive is staged before a job ID exists.
+func (s *Storage) CreateContextArchiveFromDirToPath(sourceDir, destPath string, excludeFiles ...string) (string, error) {
+	excludeSet := make(map[string]bool)
+	for _, excludeFile := range excludeFiles {
+		excludePath := filepath.Clean(excludeFile)
+		excludeSet[excludePath] = true
+		excludeSet[filepath.ToSlash(excludePath)] = true
+	}
+
+	var filesToInclude []string
+	err := filepath.Walk(sourceDir, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if info.IsDir() {
+			return nil
+		}
+		if isBlenderSaveFile(info.Name()) {
+			return nil
+		}
+
+		relPath, err := filepath.Rel(sourceDir, path)
+		if err != nil {
+			return err
+		}
+		cleanRelPath := filepath.Clean(relPath)
+		if strings.HasPrefix(cleanRelPath, "..") {
+			return fmt.Errorf("invalid file path: %s", relPath)
+		}
+		if excludeSet[cleanRelPath] || excludeSet[filepath.ToSlash(cleanRelPath)] {
+			return nil
+		}
+
+		filesToInclude = append(filesToInclude, path)
+		return nil
+	})
+	if err != nil {
+		return "", fmt.Errorf("failed to walk source directory: %w", err)
+	}
+	if len(filesToInclude) == 0 {
+		return "", fmt.Errorf("no files found to include in context archive")
+	}
+
+	relPaths := make([]string, 0, len(filesToInclude))
+	for _, filePath := range filesToInclude {
+		relPath, err := filepath.Rel(sourceDir, filePath)
+		if err != nil {
+			return "", fmt.Errorf("failed to get relative path: %w", err)
+		}
+		relPaths = append(relPaths, relPath)
+	}
+
+	commonPrefix := findCommonPrefix(relPaths)
+	blendFilesAtRoot := 0
+	for _, relPath := range relPaths {
+		tarPath := filepath.ToSlash(relPath)
+		if commonPrefix != "" && strings.HasPrefix(tarPath, commonPrefix) {
+			tarPath = strings.TrimPrefix(tarPath, commonPrefix)
+		}
+		if strings.HasSuffix(strings.ToLower(tarPath), ".blend") && !strings.Contains(tarPath, "/") {
+			blendFilesAtRoot++
+		}
+	}
+	if blendFilesAtRoot == 0 {
+		return "", fmt.Errorf("no .blend file found at root level in context archive - .blend files must be at the root level of the uploaded archive, not in subdirectories")
+	}
+	if blendFilesAtRoot > 1 {
+		return "", fmt.Errorf("multiple .blend files found at root level in context archive (found %d, expected 1)", blendFilesAtRoot)
+	}
+
+	contextFile, err := os.Create(destPath)
+	if err != nil {
+		return "", fmt.Errorf("failed to create context file: %w", err)
+	}
+	defer contextFile.Close()
+
+	tarWriter := tar.NewWriter(contextFile)
+	defer tarWriter.Close()
+	copyBuf := make([]byte, 32*1024)
+
+	for i, filePath := range filesToInclude {
+		file, err := os.Open(filePath)
+		if err != nil {
+			return "", fmt.Errorf("failed to open file: %w", err)
+		}
+
+		info, err := file.Stat()
+		if err != nil {
+			file.Close()
+			return "", fmt.Errorf("failed to stat file: %w", err)
+		}
+
+		tarPath := filepath.ToSlash(relPaths[i])
+		if commonPrefix != "" && strings.HasPrefix(tarPath, commonPrefix) {
+			tarPath = strings.TrimPrefix(tarPath, commonPrefix)
+		}
+
+		header, err := tar.FileInfoHeader(info, "")
+		if err != nil {
+			file.Close()
+			return "", fmt.Errorf("failed to create tar header: %w", err)
+		}
+		header.Name = tarPath
+
+		if err := tarWriter.WriteHeader(header); err != nil {
+			file.Close()
+			return "", fmt.Errorf("failed to write tar header: %w", err)
+		}
+
+		if _, err := io.CopyBuffer(tarWriter, file, copyBuf); err != nil {
+			file.Close()
+			return "", fmt.Errorf("failed to write file to tar: %w", err)
+		}
+		file.Close()
+	}
+
+	if err := tarWriter.Close(); err != nil {
+		return "", fmt.Errorf("failed to close tar writer: %w", err)
+	}
+	if err := contextFile.Close(); err != nil {
+		return "", fmt.Errorf("failed to close context file: %w", err)
+	}
+
+	return destPath, nil
+}