refactor: region from document, not app config

- Add region column to leaudit_documents + LeauditDocument model
- AuditServiceImpl: read region from document.region, not APP_REGION
- RuleServiceImpl: ListBindings/CreateBinding accept Region parameter
- RuleBindingCreateDTO: add region field
- RuleController: pass region from query param/DTO to service
- APP_REGION removed from binding queries; region flows from document

Region is now per-document: each document carries its region at upload
time, and rules are matched to the document's region at run time.

fastapi_modules/fastapi_leaudit/services/ruleService.py

@@ -66,8 +66,8 @@ class IRuleService(ABC):
         ...
 
     @abstractmethod
-    async def ListBindings(self, RuleType: str | None = None) -> list[RuleBindingVO]:
-        """列出规则类型绑定。可按规则类型过滤。"""
+    async def ListBindings(self, RuleType: str | None = None, Region: str | None = None) -> list[RuleBindingVO]:
+        """列出规则类型绑定。可按规则类型/地区过滤。"""
         ...
 
     @abstractmethod
@@ -75,6 +75,7 @@ class IRuleService(ABC):
         self,
         DocTypeId: int,
         RuleSetId: int,
+        Region: str = "default",
         BindingMode: str = "explicit",
         Priority: int = 0,
         DocTypeCode: str | None = None,