Feat: add context for figure and table (#11547)

### What problem does this PR solve?

Add context for figure table.



![demo_figure_table_context](https://github.com/user-attachments/assets/61b37fac-e22e-40a4-9665-9396c7b4103e)


`==================()` for demonstrating purpose. 
### Type of change

- [x] New Feature (non-breaking change which adds functionality)

rag/app/paper.py

@@ -20,7 +20,7 @@ import re
 
 from deepdoc.parser.figure_parser import vision_figure_parser_pdf_wrapper
 from common.constants import ParserType
-from rag.nlp import rag_tokenizer, tokenize, tokenize_table, add_positions, bullets_category, title_frequency, tokenize_chunks
+from rag.nlp import rag_tokenizer, tokenize, tokenize_table, add_positions, bullets_category, title_frequency, tokenize_chunks, attach_media_context
 from deepdoc.parser import PdfParser
 import numpy as np
 from rag.app.naive import by_plaintext, PARSERS
@@ -150,7 +150,7 @@ def chunk(filename, binary=None, from_page=0, to_page=100000,
             "chunk_token_num": 512, "delimiter": "\n!?。；！？", "layout_recognize": "DeepDOC"})
     if re.search(r"\.pdf$", filename, re.IGNORECASE):
         layout_recognizer = parser_config.get("layout_recognize", "DeepDOC")
-        
+
         if isinstance(layout_recognizer, bool):
             layout_recognizer = "DeepDOC" if layout_recognizer else "Plain Text"
 
@@ -234,6 +234,10 @@ def chunk(filename, binary=None, from_page=0, to_page=100000,
         chunks.append(txt)
         last_sid = sec_id
     res.extend(tokenize_chunks(chunks, doc, eng, pdf_parser))
+    table_ctx = max(0, int(parser_config.get("table_context_size", 0) or 0))
+    image_ctx = max(0, int(parser_config.get("image_context_size", 0) or 0))
+    if table_ctx or image_ctx:
+        attach_media_context(res, table_ctx, image_ctx)
     return res