Refactor code structure for improved readability and maintainability

data/pdf_chunks/page_1.txt

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+=== 第 1 页切片结果 ===
+图片: page_1.png
+MD5: 3a0587908dec601c902b954eeecc6365
+文本长度: 194 字符
+切片大小: 500 字符
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+--- Chunk 0 ---
+长度: 194 字符
+内容:
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data/pdf_chunks/page_10.txt

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+=== 第 10 页切片结果 ===
+图片: page_10.png
+MD5: e043bd43659fa8cd131f0d1c4b90c4db
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+切片数量: 3 个
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+--- Chunk 2 ---
+长度: 33 字符
+内容:
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data/pdf_chunks/page_11.txt

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+=== 第 11 页切片结果 ===
+图片: page_11.png
+MD5: 256acb056ed96cb4ab582d55b3792e49
+文本长度: 1147 字符
+切片大小: 500 字符
+切片数量: 3 个
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+--- Chunk 0 ---
+长度: 500 字符
+内容:
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data/pdf_chunks/page_12.txt

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+=== 第 12 页切片结果 ===
+图片: page_12.png
+MD5: 36205c3c596cc35b23b053fb82ff16f0
+文本长度: 380 字符
+切片大小: 500 字符
+切片数量: 1 个
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+--- Chunk 0 ---
+长度: 380 字符
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data/pdf_chunks/page_13.txt

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+=== 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
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+--- Chunk 0 ---
+长度: 422 字符
+内容:
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data/pdf_chunks/page_14.txt

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+=== 第 14 页切片结果 ===
+图片: page_14.png
+MD5: 1786903bed6f0742383508e7de103f6a
+文本长度: 0 字符
+切片大小: 500 字符
+切片数量: 0 个
+

data/pdf_chunks/page_2.txt

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+=== 第 2 页切片结果 ===
+图片: page_2.png
+MD5: 5a0da54af84e8f0a099ce6b22e5d870d
+文本长度: 1858 字符
+切片大小: 500 字符
+切片数量: 4 个
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+--- Chunk 0 ---
+长度: 500 字符
+内容:
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data/pdf_chunks/page_3.txt

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+=== 第 3 页切片结果 ===
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+MD5: 1ce32bc780c7e9192ce48acc2b9f7dea
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data/pdf_chunks/page_4.txt

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+=== 第 4 页切片结果 ===
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data/pdf_chunks/page_5.txt

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+=== 第 5 页切片结果 ===
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data/pdf_chunks/page_6.txt

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data/pdf_chunks/page_7.txt

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