refactor(factor): 完全重构因子计算框架 - 引入DSL表达式系统

- 删除旧因子框架：移除 base.py、composite.py、data_loader.py、data_spec.py
  及所有子模块（momentum、financial、quality、sentiment等）
- 新增DSL表达式系统：实现 factor DSL 编译器和翻译器
  - dsl.py: 领域特定语言定义
  - compiler.py: AST编译与优化
  - translator.py: Polars表达式翻译
  - api.py: 统一API接口
- 新增数据路由层：data_router.py 实现字段到表的动态路由
- 新增API封装：api_pro_bar.py 提供pro_bar数据接口
- 更新执行引擎：engine.py 适配新的DSL架构
- 重构测试体系：删除旧测试，新增 test_dsl_promotion.py、
  test_factor_integration.py、test_pro_bar.py
- 清理文档：删除8个过时文档（factor_design、db_sync_guide等）

src/data/db_inspector.py

@@ -32,9 +32,12 @@ def get_db_info(db_path: Optional[Path] = None):
 
     # Get database path
     if db_path is None:
-        from src.data.config import get_config
+        from src.config.settings import get_settings
 
-        cfg = get_config()
+        cfg = get_settings()
+        db_path = cfg.data_path_resolved / "prostock.db"
+
+        cfg = get_settings()
         db_path = cfg.data_path_resolved / "prostock.db"
     else:
         db_path = Path(db_path)
@@ -231,9 +234,12 @@ def get_table_sample(table_name: str, limit: int = 5, db_path: Optional[Path] =
         db_path: Path to database file
     """
     if db_path is None:
-        from src.data.config import get_config
+        from src.config.settings import get_settings
 
-        cfg = get_config()
+        cfg = get_settings()
+        db_path = cfg.data_path_resolved / "prostock.db"
+
+        cfg = get_settings()
         db_path = cfg.data_path_resolved / "prostock.db"
     else:
         db_path = Path(db_path)