feat: add example PDFs via LFS and gr.Examples in UI

.gitattributes

@@ -0,0 +1 @@
+examples/VQA/*.pdf filter=lfs diff=lfs merge=lfs -text

app.py

@@ -213,6 +213,32 @@ with gr.Blocks(title="DataFlow-VQA · PDF 提取 Demo", theme=gr.themes.Soft())
 | **MinerU API Key** | 解析 PDF 版面（与 LLM 完全独立） | [mineru.net/apiManage/token](https://mineru.net/apiManage/token) |
 """)
 
+    gr.Markdown("### 📋 示例文件（点击加载后再填入 API Key 运行）")
+    gr.Examples(
+        label="内置示例 PDF",
+        examples=[
+            [
+                ["examples/VQA/questionextract_test.pdf"],
+                "test_single",
+                "https://generativelanguage.googleapis.com/v1beta/openai/",
+                "",
+                "",
+                "gemini-2.5-pro",
+                5,
+            ],
+            [
+                ["examples/VQA/math_question.pdf", "examples/VQA/math_answer.pdf"],
+                "math_split",
+                "https://generativelanguage.googleapis.com/v1beta/openai/",
+                "",
+                "",
+                "gemini-2.5-pro",
+                5,
+            ],
+        ],
+        inputs=[pdf_files, task_name, api_url, llm_api_key, mineru_api_key, model_name, max_workers],
+    )
+
     run_btn.click(
         fn=run_vqa_extraction,
         inputs=[pdf_files, task_name, api_url, llm_api_key, mineru_api_key, model_name, max_workers],

examples/VQA/math_answer.pdf

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:e0d15cde9173b113ada95f273dc46e14a5a18f0129c2ab7c063f2a425cdb29ca
+size 62008

examples/VQA/math_question.pdf

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:4f8b62f332fbd67dffb6e30b1d4204711de1f62fa0949f807a15a9ca97a93f6a
+size 75286

examples/VQA/questionextract_test.pdf

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:275bc7c50e14667df4cee5386ff9ff1ea5ade3729c11568feca93b9557b49592
+size 88256