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.

.claude/settings.local.json

@@ -0,0 +1,9 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(git rev-parse:*)",
+      "Bash(findstr:*)",
+      "Bash(find:*)"
+    ]
+  }
+}