refactor: 统一代码格式，调整多行代码换行风格

对多个文件进行代码格式化调整，将长行参数拆分为多行书写，提升代码可读性，包括：
- 调整函数定义、调用的多行换行格式
- 优化列表、元组、字典的多行排版
- 新增README.md项目说明文档

tests/test_document_upload_api.py

@@ -34,7 +34,9 @@ def client(monkeypatch: pytest.MonkeyPatch, tmp_path: Path) -> Iterator[TestClie
         return None
 
     monkeypatch.setattr(QdrantService, "ensure_collections", _noop_ensure_collections)
-    monkeypatch.setattr(document_module.settings, "upload_dir", str(tmp_path / "uploads"))
+    monkeypatch.setattr(
+        document_module.settings, "upload_dir", str(tmp_path / "uploads")
+    )
     with TestClient(app) as test_client:
         yield test_client
 
@@ -45,7 +47,13 @@ def _inject_manager(monkeypatch: pytest.MonkeyPatch, manager: FakeManager) -> No
 
 def _make_minimal_pdf(text: str = "Hello PDF World") -> bytes:
     content_stream = f"BT /F1 24 Tf 100 700 Td ({text}) Tj ET".encode("latin-1")
-    content_obj = b"<< /Length " + str(len(content_stream)).encode() + b" >>\nstream\n" + content_stream + b"\nendstream"
+    content_obj = (
+        b"<< /Length "
+        + str(len(content_stream)).encode()
+        + b" >>\nstream\n"
+        + content_stream
+        + b"\nendstream"
+    )
     return (
         b"%PDF-1.0\n"
         b"1 0 obj\n<< /Type /Catalog /Pages 2 0 R >>\nendobj\n"
@@ -161,7 +169,13 @@ def test_upload_docx_extracts_text(
     content = _make_docx(["第一段落", "第二段落"])
     resp = client.post(
         "/api/v1/documents/upload",
-        files={"file": ("doc.docx", content, "application/vnd.openxmlformats-officedocument.wordprocessingml.document")},
+        files={
+            "file": (
+                "doc.docx",
+                content,
+                "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
+            )
+        },
     )
 
     assert resp.status_code == 202