Fix: add toc_kwd field and update page_num_int type (#10596)

### What problem does this PR solve?

- Added new field 'toc_kwd' to infinity_mapping.json for table of
contents keyword support
- Changed page_num_int from integer to array type in task_executor.py to
handle multiple page numbers

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

rag/svr/task_executor.py

@@ -447,7 +447,7 @@ def build_TOC(task, docs, progress_callback):
         d["content_with_weight"] = json.dumps(toc, ensure_ascii=False)
         d["toc_kwd"] = "toc"
         d["available_int"] = 0
-        d["page_num_int"] = 100000000
+        d["page_num_int"] = [100000000]
         d["id"] = xxhash.xxh64((d["content_with_weight"] + str(d["doc_id"])).encode("utf-8", "surrogatepass")).hexdigest()
         return d