Refactor document handling and update Milvus collection settings

- Removed multiple failed document entries from `documents.json`.
- Added a new document entry with updated metadata and changed the index name to `regulations_dense_1024_v2`.
- Updated architecture documentation to reflect changes in the Milvus collection name.
- Adjusted requirements by removing the sqlalchemy dependency.
- Modified test cases to align with new document structure and naming conventions.
- Introduced a new test file for Milvus vector index runtime recovery and error handling.
- Updated assertions in various test files to ensure compatibility with the new schema.

backend/app/infrastructure/parser/vector_chunk_builder.py

@@ -19,29 +19,35 @@ class AliyunVectorChunkBuilder(ChunkBuilder):
         """Handle build for the Aliyun Vector Chunk Builder instance."""
         chunks: list[Chunk] = []
         for index, item in enumerate(parsed_document.vector_chunks):
-            content = item.get("content") or item.get("text") or ""
-            embedding_text = item.get("embedding_text") or content
+            text = item.get("text") or ""
+            embedding_text = item.get("embedding_text") or text
             if not embedding_text.strip():
                 continue
             section_path = item.get("section_path") or []
             section_title = item.get("section_title") or (section_path[-1] if section_path else "")
-            page_number = item.get("page_start") or item.get("page") or 0
             chunk_id = item.get("chunk_id") or f"{parsed_document.doc_id}-chunk-{index}"
-            metadata = {k: v for k, v in item.items() if k not in {"content", "embedding_text"}}
+            metadata = dict(item)
+            metadata["regulation_type"] = regulation_type
+            metadata["version"] = version
             chunks.append(
                 Chunk(
                     chunk_id=str(chunk_id),
                     doc_id=parsed_document.doc_id,
-                    doc_name=parsed_document.doc_name,
-                    content=content,
+                    doc_title=str(item.get("doc_title") or parsed_document.doc_name),
+                    text=text,
                     embedding_text=embedding_text,
+                    chunk_type=str(item.get("chunk_type", item.get("block_type", ""))),
+                    chunk_index=int(item.get("chunk_index") or 0),
+                    piece_index=int(item.get("piece_index") or 0),
+                    page_start=int(item.get("page_start") or 0),
+                    page_end=int(item.get("page_end") or 0),
                     section_title=section_title,
                     section_path=section_path,
-                    page_number=int(page_number or 0),
+                    section_level=int(item.get("section_level") or len(section_path)),
+                    source_ids=[str(v) for v in item.get("source_ids", [])],
                     regulation_type=regulation_type,
                     version=version,
                     semantic_id=item.get("semantic_id", ""),
-                    block_type=item.get("block_type", ""),
                     metadata=metadata,
                 )
             )