feat: 添加 Spider 基类 + Pipeline 配置 + 测试

tests/conftest.py

@@ -0,0 +1,13 @@
+import pytest
+
+
+@pytest.fixture
+def sample_announcement_data():
+    return {
+        "title": "测试公告标题",
+        "publish_date": "2026-05-09",
+        "purchase_name": "测试单位",
+        "content_url": "https://example.com/detail/123",
+        "source_code": "ZcyAnnouncement1",
+        "source_name": "采购公告",
+    }