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/api_bak_basic.py

@@ -129,7 +129,9 @@ def sync_bak_basic(
             columns = []
             for col in sample.columns:
                 dtype = str(sample[col].dtype)
-                if "int" in dtype:
+                if col == "trade_date":
+                    col_type = "DATE"
+                elif "int" in dtype:
                     col_type = "INTEGER"
                 elif "float" in dtype:
                     col_type = "DOUBLE"
@@ -223,10 +225,16 @@ def sync_bak_basic(
 
     # Combine and save
     combined = pd.concat(all_data, ignore_index=True)
+    
+    # Convert trade_date to datetime for proper DATE type storage
+    combined["trade_date"] = pd.to_datetime(combined["trade_date"], format="%Y%m%d")
+    
     print(f"[sync_bak_basic] Total records: {len(combined)}")
 
     # Delete existing data for the date range and append new data
-    storage._connection.execute(f'DELETE FROM "{TABLE_NAME}" WHERE "trade_date" >= ?', [sync_start])
+    # Convert sync_start to date format for comparison with DATE column
+    sync_start_date = pd.to_datetime(sync_start, format="%Y%m%d").date()
+    storage._connection.execute(f'DELETE FROM "{TABLE_NAME}" WHERE "trade_date" >= ?', [sync_start_date])
     thread_storage.queue_save(TABLE_NAME, combined)
     thread_storage.flush()