Refactor code structure for improved readability and maintainability

data/pdf_chunks/page_13.txt

@@ -0,0 +1,25 @@
+=== 第 13 页切片结果 ===
+图片: page_13.png
+MD5: c2a7f4413915dde39c39f15dd5b9c532
+文本长度: 422 字符
+切片大小: 500 字符
+切片数量: 1 个
+
+--- Chunk 0 ---
+长度: 422 字符
+内容:
+!!a312345C3gXH?NOPWN@?EFGH!4_CNuv?r/’56~jNOP
+l(ls"a3EFGHH?EB[?@H?EB\&’!4?@H?EB~Ri3,fWC"(H
+X0EBrsC!/2HH"?@H?EB[EFGHH?EBZ~\)*p"Ri?,fW(H6
+DCr6fEBZ,D&’?"+b~O\p"^R,W(Hm}~At12345CNuvm!;
+<G*Qw*+,#j-;<G(V?.9KL/)"
+($!!!ABC}~AB#%"$($’$$$
+)nt)DEFnyC\pk]mfu"hiDNF?wxoS}&++B ?0!_7C0"z[
+DEFT?8Mk%&D,#@=’$"
+< &!ABC}~AB
+($!$!ABC(8KLAB#%"$($’$($
+)DEF91KG{C5z."lEFs!qD,GLR?0TkynyGH!wNjDEF%"
+lnyGHS}"+B&0 ?0T#@=($"
+< #!ABC(8KLAB
+!"!"#"#!$%%&
+