Refactor import statements for ResponseBase in API routers

- Updated import statements in the following files to import ResponseBase directly from models instead of models.response:
  - routers/api/v1/share/__init__.py
  - routers/api/v1/site/__init__.py
  - routers/api/v1/slave/__init__.py
  - routers/api/v1/tag/__init__.py
  - routers/api/v1/user/__init__.py
  - routers/api/v1/vas/__init__.py
  - routers/api/v1/webdav/__init__.py

Enhance user registration and related endpoints in user router

- Changed return type annotations from models.response.ResponseBase to models.ResponseBase in multiple functions.
- Updated return statements to reflect the new import structure.
- Improved documentation for clarity.

Add PhysicalFile model and storage service implementation

- Introduced PhysicalFile model to represent actual files on disk with reference counting logic.
- Created storage service module with local storage implementation, including file operations and error handling.
- Defined exceptions for storage operations to improve error handling.
- Implemented naming rule parser for generating file and directory names based on templates.

Update dependency management in uv.lock

- Added aiofiles version 25.1.0 to the project dependencies.

models/migration.py

@@ -283,6 +283,7 @@ async def init_default_user() -> None:
 async def init_default_policy() -> None:
     from .policy import Policy, PolicyType
     from .database import get_session
+    from service.storage import LocalStorageService
 
     log.info('初始化默认存储策略...')
 
@@ -302,6 +303,10 @@ async def init_default_policy() -> None:
                 file_name_rule="{randomkey16}_{originname}",
             )
 
-            await local_policy.save(session)
+            local_policy = await local_policy.save(session)
+
+            # 创建物理存储目录
+            storage_service = LocalStorageService(local_policy)
+            await storage_service.ensure_base_directory()
 
             log.info('已创建默认本地存储策略，存储目录：./data')