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.

env.md

@@ -0,0 +1,12 @@
+# 环境变量字段
+
+- `MODE` str 运行模式，默认 `master`
+  - `master` 主机模式
+  - `slave` 从机模式
+- `DEBUG` bool 是否开启调试模式，默认 `false`
+- `DATABASE_URL`: 数据库连接信息，默认 `sqlite+aiosqlite:///disknext.db`
+- `REDIS_HOST`: Redis 主机地址
+- `REDIS_PORT`: Redis 端口
+- `REDIS_PASSWORD`: Redis 密码
+- `REDIS_DB`: Redis 数据库
+- `REDIS_PROTOCOL`: Redis 协议