fix: rewrite projects/ and demos with new data api

demo/demo.py

 import os
 
 from loguru import logger
-from magic_pdf.pipe.UNIPipe import UNIPipe
-from magic_pdf.rw.DiskReaderWriter import DiskReaderWriter
 
+from magic_pdf.data.data_reader_writer import FileBasedDataWriter
+from magic_pdf.pipe.UNIPipe import UNIPipe
 
 try:
     current_script_dir = os.path.dirname(os.path.abspath(__file__))
-    demo_name = "demo1"
-    pdf_path = os.path.join(current_script_dir, f"{demo_name}.pdf")
-    pdf_bytes = open(pdf_path, "rb").read()
-    jso_useful_key = {"_pdf_type": "", "model_list": []}
+    demo_name = 'demo1'
+    pdf_path = os.path.join(current_script_dir, f'{demo_name}.pdf')
+    pdf_bytes = open(pdf_path, 'rb').read()
+    jso_useful_key = {'_pdf_type': '', 'model_list': []}
     local_image_dir = os.path.join(current_script_dir, 'images')
     image_dir = str(os.path.basename(local_image_dir))
-    image_writer = DiskReaderWriter(local_image_dir)
+    image_writer = FileBasedDataWriter(local_image_dir)
     pipe = UNIPipe(pdf_bytes, jso_useful_key, image_writer)
     pipe.pipe_classify()
     pipe.pipe_analyze()
     pipe.pipe_parse()
-    md_content = pipe.pipe_mk_markdown(image_dir, drop_mode="none")
-    with open(f"{demo_name}.md", "w", encoding="utf-8") as f:
+    md_content = pipe.pipe_mk_markdown(image_dir, drop_mode='none')
+    with open(f'{demo_name}.md', 'w', encoding='utf-8') as f:
         f.write(md_content)
 except Exception as e:
-    logger.exception(e)
+    logger.exception(e)
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