feat: Enhance file management and user features

- Add file deduplication mechanism based on PhysicalFile reference counting.
- Implement chunked upload support for large files with resumable uploads.
- Update sharing page to automatically render README and preview content.
- Integrate Redis for caching and token storage (optional).
- Refactor project structure to include new models for download tasks, nodes, and tasks.
- Introduce user filtering parameters for admin user management.
- Add CORS middleware for handling cross-origin requests.
- Improve error messages for authentication failures.
- Update user model to include two-factor authentication key management.
- Enhance API documentation and response models for clarity.
- Implement admin checks for user management and permissions.

models/migration.py

@@ -25,7 +25,7 @@ default_settings: list[Setting] = [
     Setting(name="siteURL", value="http://localhost", type=SettingsType.BASIC),
     Setting(name="siteName", value="DiskNext", type=SettingsType.BASIC),
     Setting(name="register_enabled", value="1", type=SettingsType.REGISTER),
-    Setting(name="default_group", value="", type=SettingsType.REGISTER),  # UUID 在组创建后更新
+    Setting(name="default_group", value="", type=SettingsType.REGISTER),
     Setting(name="siteKeywords", value="网盘，网盘", type=SettingsType.BASIC),
     Setting(name="siteDes", value="DiskNext", type=SettingsType.BASIC),
     Setting(name="siteTitle", value="云星启智", type=SettingsType.BASIC),