refactor(archive): move unused modules to archive/

Archive legacy framework and utility modules that are no longer
referenced by the active core (datasource/ and rotation/):

- framework/ -> archive/framework/
- framework_v2/ -> archive/framework_v2/
- strategies/ -> archive/strategies/
- config/ -> archive/config/
- visualization/ -> archive/visualization/
- scripts/ -> archive/scripts/
- tests/ -> archive/tests/
- run_rotation.py, run_us_rotation.py -> archive/single_files/
- compare_*.py, test_api_dates.py -> archive/single_files/

archive/strategies/base.py

@@ -0,0 +1,41 @@
+"""
+策略基类定义
+"""
+
+from abc import ABC, abstractmethod
+from typing import Any
+
+
+class Strategy(ABC):
+    """策略抽象基类"""
+
+    def __init__(self, name: str, config: dict = None):
+        self.name = name
+        self.config = config or {}
+
+    @abstractmethod
+    def run(self, **kwargs) -> Any:
+        """执行策略"""
+        pass
+
+    @abstractmethod
+    def get_signals(self, **kwargs) -> Any:
+        """获取当前信号"""
+        pass
+
+
+class BacktestStrategy(Strategy):
+    """回测策略基类"""
+
+    def __init__(self, name: str, config: dict = None):
+        super().__init__(name, config)
+        self.results = None
+
+    @abstractmethod
+    def run_backtest(self, **kwargs) -> dict:
+        """执行回测，返回绩效指标"""
+        pass
+
+    def get_results(self) -> dict:
+        """获取回测结果"""
+        return self.results