refactor: establish standalone application boundary

tests/test_market_mode.py

@@ -5,15 +5,15 @@ import unittest
 from datetime import datetime, timedelta, timezone
 from pathlib import Path
 
-from tushare_client import _sector_coverage_issue
+from backend.data.providers.tushare_client import _sector_coverage_issue
 
 
 def load_method(name: str):
-    source = Path("backend/features/heaven/service.py").read_text(encoding="utf-8")
+    source = Path("backend/features/heaven/trend.py").read_text(encoding="utf-8")
     tree = ast.parse(source)
     dashboard_service = next(
         node for node in tree.body
-        if isinstance(node, ast.ClassDef) and node.name == "HeavenServiceMixin"
+        if isinstance(node, ast.ClassDef) and node.name == "HeavenTrendMixin"
     )
     method = next(
         node for node in dashboard_service.body