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.

tests/test_parser.py

@@ -113,12 +113,12 @@ class FakeAgentConversationService:
             sources=[
                 AnswerSource(
                     doc_id="doc-api-1",
-                    doc_name="测试法规",
+                    doc_title="测试法规",
                     chunk_id="chunk-1",
                     section_title="第一章",
-                    page_number=1,
+                    page_start=1,
                     score=0.92,
-                    content="法规原文",
+                    text="法规原文",
                     metadata={"section_title": "第一章"},
                 )
             ],
@@ -218,7 +218,6 @@ def test_agent_ask_and_stream_contract_preserved(monkeypatch):
 
     store = FakeConversationStore()
     monkeypatch.setattr(agent, "get_agent_conversation_service", lambda: FakeAgentConversationService())
-    monkeypatch.setattr(agent, "get_conversation_store", lambda: store)
 
     client = TestClient(app)