Fix linter errors: remove unused import and obsolete code, keep only streaming ZIP logic

Author: coolnipunj

src/sumbuddy/__main__.py

@@ -7,7 +7,6 @@
 from tqdm import tqdm
 import sys
 import os
-import zipfile
 from sumbuddy.archive import ArchiveHandler
 
 def get_checksums(input_path, output_filepath=None, ignore_file=None, include_hidden=False, algorithm='md5', length=None):

src/sumbuddy/archive.py

@@ -36,7 +36,7 @@ def process_zip(self, zip_path, root_dir):
                 for member in zip_ref.namelist():
                     # Only add files, not directories
                     if member.endswith('/'):
-                        continued
+                        continue
                     full_path = os.path.join(self.temp_dir, member)
                     # The path as it should appear in the CSV: zip_path/member
                     rel_path = f"{zip_path}/{member}"