Storage: Rename all the variables about get file to storage from minio. (#2497)

https://github.com/infiniflow/ragflow/issues/2496

### What problem does this PR solve?

_Briefly describe what this PR aims to solve. Include background context
that will help reviewers understand the purpose of the PR._

### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [ ] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [x] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

api/db/services/file2document_service.py

@@ -69,7 +69,7 @@ class File2DocumentService(CommonService):
 
     @classmethod
     @DB.connection_context()
-    def get_minio_address(cls, doc_id=None, file_id=None):
+    def get_storage_address(cls, doc_id=None, file_id=None):
         if doc_id:
             f2d = cls.get_by_document_id(doc_id)
         else: