Refactor and enhance OAuth2.0 implementation; update models and routes

- Refactored AdminSummaryData and AdminSummaryResponse classes for better clarity.
- Added OAUTH type to SettingsType enum.
- Cleaned up imports in webdav.py.
- Updated admin router to improve summary data retrieval and response handling.
- Enhanced file management routes with better condition handling and user storage updates.
- Improved group management routes by optimizing data retrieval.
- Refined task management routes for better condition handling.
- Updated user management routes to streamline access token retrieval.
- Implemented a new captcha verification structure with abstract base class.
- Removed deprecated env.md file and replaced with a new structured version.
- Introduced a unified OAuth2.0 client base class for GitHub and QQ integrations.
- Enhanced password management with improved hashing strategies.
- Added detailed comments and documentation throughout the codebase for clarity.

models/webdav.py

@@ -2,7 +2,7 @@
 from typing import TYPE_CHECKING
 from uuid import UUID
 
-from sqlmodel import Field, Relationship, UniqueConstraint, text, Column, func, DateTime
+from sqlmodel import Field, Relationship, UniqueConstraint
 
 from .base import SQLModelBase
 from .mixin import TableBaseMixin