大更新，架构调整，数据分析能力提升，

tests/conftest.py

@@ -0,0 +1,11 @@
+# -*- coding: utf-8 -*-
+"""
+Conftest for property-based tests.
+Ensures the project root is on sys.path for direct module imports.
+"""
+import sys
+import os
+
+# Add project root to sys.path so we can import modules directly
+# (e.g., `from config.app_config import AppConfig`)
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))