Fix SSE route dependency and align architecture docs

backend/app/infrastructure/parser/local_document_parser.py

@@ -0,0 +1,38 @@
+"""Local parser adapter for the migrated backend architecture."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+from app.domain.documents import DocumentParser, ParsedDocument
+from app.services.parser.docx_parser import parse_docx_to_markdown
+from app.services.parser.pdf_parser import parse_pdf_to_markdown
+
+
+class LocalDocumentParser(DocumentParser):
+    """Adapt the existing local PDF/DOCX parsers to the new parser port."""
+
+    parser_name = "local_markdown_parser"
+
+    def parse(self, *, file_path: str, doc_id: str, doc_name: str) -> ParsedDocument:
+        suffix = Path(file_path).suffix.lower()
+        if suffix == ".pdf":
+            markdown_text = parse_pdf_to_markdown(file_path)
+        elif suffix in {".docx", ".doc"}:
+            markdown_text = parse_docx_to_markdown(file_path)
+        else:
+            raise ValueError(f"不支持的文件类型: {suffix}")
+
+        if not markdown_text.strip():
+            raise ValueError("本地解析完成但未提取到有效文本")
+
+        return ParsedDocument(
+            doc_id=doc_id,
+            doc_name=doc_name,
+            structure_nodes=[],
+            semantic_blocks=[],
+            vector_chunks=[],
+            parser_name=self.parser_name,
+            raw_text=markdown_text,
+            metadata={"source": "local_parser", "file_suffix": suffix},
+        )