Update agent orchestration and knowledge flow

Add sub-commander orchestration updates, align frontend integrations, and refine knowledge view behavior without including local data artifacts.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/services/document_service.py

@@ -3,6 +3,8 @@
 支持多种文档格式 + LlamaIndex 智能分块
 """
 
+from pathlib import Path
+import tempfile
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy import select
 from fastapi import UploadFile
@@ -380,7 +382,42 @@ class DocumentService:
         if hasattr(mineru, "parse_to_markdown"):
             return mineru.parse_to_markdown(file_path)
 
-        raise ValueError("PDF 解析失败: MinerU 不支持当前接口")
+        try:
+            from mineru.cli.common import do_parse, read_fn
+            from mineru.utils.enum_class import MakeMode
+        except Exception as error:
+            raise ValueError(
+                "PDF 解析失败: 当前安装的 MinerU 版本接口不兼容，请确认支持 to_markdown / parse_to_markdown，或提供 cli.common.do_parse 能力"
+            ) from error
+
+        with tempfile.TemporaryDirectory(prefix="mineru-") as output_dir:
+            pdf_name = Path(file_path).stem
+            pdf_bytes = read_fn(Path(file_path))
+            try:
+                do_parse(
+                    output_dir,
+                    [pdf_name],
+                    [pdf_bytes],
+                    ["zh"],
+                    f_draw_layout_bbox=False,
+                    f_draw_span_bbox=False,
+                    f_dump_md=True,
+                    f_dump_middle_json=False,
+                    f_dump_model_output=False,
+                    f_dump_orig_pdf=False,
+                    f_dump_content_list=False,
+                    f_make_md_mode=MakeMode.MM_MD,
+                )
+            except ModuleNotFoundError as error:
+                dependency = getattr(error, "name", None) or str(error).split("'")[-2] if "'" in str(error) else str(error)
+                raise ValueError(f"PDF 解析依赖缺失: MinerU 运行时依赖 {dependency}") from error
+            markdown_path = Path(output_dir) / pdf_name / "pipeline" / f"{pdf_name}.md"
+            if markdown_path.exists():
+                return markdown_path.read_text(encoding="utf-8")
+
+        raise ValueError(
+            "PDF 解析失败: 当前安装的 MinerU 版本接口不兼容，请确认支持 to_markdown / parse_to_markdown，或提供 cli.common.do_parse 能力"
+        )
 
     async def _parse_pdf(self, file_path: str) -> ParsedDocument:
         markdown = await self._parse_pdf_with_mineru(file_path)