chore: initial commit — leaudit-platform project skeleton

17-table PostgreSQL schema with full Chinese column comments,
FastAPI project structure (admin/common/modules),
DSL rule files, and schema migration scripts.

fastapi_common/fastapi_common_web/exception/Base/BusinessException.py

@@ -0,0 +1,14 @@
+"""业务异常基类。"""
+
+from __future__ import annotations
+
+from fastapi_common.fastapi_common_web.domain.responses import StatusCodeEnum
+
+
+class BusinessException(Exception):
+    """所有业务异常继承此类。"""
+
+    def __init__(self, status: StatusCodeEnum, message: str):
+        self.status = status
+        self.message = message
+        super().__init__(message)