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/api_wrappers/__init__.py

@@ -5,6 +5,7 @@ All wrapper files follow the naming convention: api_{data_type}.py
 
 Available APIs:
     - api_daily: Daily market data (日线行情)
+    - api_pro_bar: Pro Bar universal market data (通用行情，后复权)
     - api_stock_basic: Stock basic information (股票基本信息)
     - api_trade_cal: Trading calendar (交易日历)
     - api_namechange: Stock name change history (股票曾用名)
@@ -12,15 +13,31 @@ Available APIs:
 
 Example:
     >>> from src.data.api_wrappers import get_daily, get_stock_basic, get_trade_cal, get_bak_basic
-    >>> from src.data.api_wrappers import get_bak_basic, sync_bak_basic
+    >>> from src.data.api_wrappers import get_pro_bar, sync_pro_bar
     >>> data = get_daily('000001.SZ', start_date='20240101', end_date='20240131')
+    >>> pro_data = get_pro_bar('000001.SZ', start_date='20240101', end_date='20240131')
     >>> stocks = get_stock_basic()
     >>> calendar = get_trade_cal('20240101', '20240131')
     >>> bak_basic = get_bak_basic(trade_date='20240101')
 """
 
-from src.data.api_wrappers.api_daily import get_daily, sync_daily, preview_daily_sync, DailySync
-from src.data.api_wrappers.financial_data.api_income import get_income, sync_income, IncomeSync
+from src.data.api_wrappers.api_daily import (
+    get_daily,
+    sync_daily,
+    preview_daily_sync,
+    DailySync,
+)
+from src.data.api_wrappers.api_pro_bar import (
+    get_pro_bar,
+    sync_pro_bar,
+    preview_pro_bar_sync,
+    ProBarSync,
+)
+from src.data.api_wrappers.financial_data.api_income import (
+    get_income,
+    sync_income,
+    IncomeSync,
+)
 from src.data.api_wrappers.api_bak_basic import get_bak_basic, sync_bak_basic
 from src.data.api_wrappers.api_namechange import get_namechange, sync_namechange
 from src.data.api_wrappers.api_stock_basic import get_stock_basic, sync_all_stocks
@@ -38,6 +55,11 @@ __all__ = [
     "sync_daily",
     "preview_daily_sync",
     "DailySync",
+    # Pro Bar (universal market data)
+    "get_pro_bar",
+    "sync_pro_bar",
+    "preview_pro_bar_sync",
+    "ProBarSync",
     # Income statement
     "get_income",
     "sync_income",