feat: complete M1-M3 infrastructure — OSS client, native execution chain, rule lifecycle API, system docs

- M1: unified OSS client (upload/download/presign) + path utils + config
- M2: rule service with validate/create/publish/rollback + binding CRUD endpoints
- M3: native AuditCtx runner, file/rule resolvers, storage adapter with full persistence
- docs: SYSTEM_OVERVIEW.md as comprehensive architecture reference
- fix: double finalize — terminal state now written once by finalize_run

fastapi_modules/fastapi_leaudit/domian/Dto/ruleValidateDto.py

@@ -0,0 +1,9 @@
+"""规则校验 DTO。"""
+
+from pydantic import BaseModel, Field
+
+
+class RuleValidateDTO(BaseModel):
+    """规则 YAML 校验请求。"""
+
+    yamlText: str = Field(..., description="规则 YAML 正文")