Refactor blob storage to use UUID primary keys and implement streaming chunking

- Changed blob table to use ID (UUID) as primary key instead of hash
- Blob records are now created at packing start, enabling immediate chunk associations
- Implemented streaming chunking to process large files without memory exhaustion
- Fixed blob manifest generation to include all referenced blobs
- Updated all foreign key references from blob_hash to blob_id
- Added progress reporting and improved error handling
- Enforced encryption requirement for all blob packing
- Updated tests to use test encryption keys
- Added Cyrillic transliteration to README

internal/database/files.go

@@ -31,6 +31,7 @@ func (r *FileRepository) Create(ctx context.Context, tx *sql.Tx, file *File) err
 
 	var err error
 	if tx != nil {
+		LogSQL("Execute", query, file.Path, file.MTime.Unix(), file.CTime.Unix(), file.Size, file.Mode, file.UID, file.GID, file.LinkTarget)
 		_, err = tx.ExecContext(ctx, query, file.Path, file.MTime.Unix(), file.CTime.Unix(), file.Size, file.Mode, file.UID, file.GID, file.LinkTarget)
 	} else {
 		_, err = r.db.ExecWithLock(ctx, query, file.Path, file.MTime.Unix(), file.CTime.Unix(), file.Size, file.Mode, file.UID, file.GID, file.LinkTarget)
@@ -81,6 +82,46 @@ func (r *FileRepository) GetByPath(ctx context.Context, path string) (*File, err
 	return &file, nil
 }
 
+func (r *FileRepository) GetByPathTx(ctx context.Context, tx *sql.Tx, path string) (*File, error) {
+	query := `
+		SELECT path, mtime, ctime, size, mode, uid, gid, link_target
+		FROM files
+		WHERE path = ?
+	`
+
+	var file File
+	var mtimeUnix, ctimeUnix int64
+	var linkTarget sql.NullString
+
+	LogSQL("GetByPathTx QueryRowContext", query, path)
+	err := tx.QueryRowContext(ctx, query, path).Scan(
+		&file.Path,
+		&mtimeUnix,
+		&ctimeUnix,
+		&file.Size,
+		&file.Mode,
+		&file.UID,
+		&file.GID,
+		&linkTarget,
+	)
+	LogSQL("GetByPathTx Scan complete", query, path)
+
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, fmt.Errorf("querying file: %w", err)
+	}
+
+	file.MTime = time.Unix(mtimeUnix, 0)
+	file.CTime = time.Unix(ctimeUnix, 0)
+	if linkTarget.Valid {
+		file.LinkTarget = linkTarget.String
+	}
+
+	return &file, nil
+}
+
 func (r *FileRepository) ListModifiedSince(ctx context.Context, since time.Time) ([]*File, error) {
 	query := `
 		SELECT path, mtime, ctime, size, mode, uid, gid, link_target