feat: add API token authentication support for qBittorrent v5.2.0+

[hongcankun]

Summary

Add support for API token authentication in qBittorrent v5.2.0+ (WebAPI v2.14.1+), allowing users to authenticate using an API token instead of username/password.

Motivation

qBittorrent v5.2.0 introduced API token authentication as a more secure alternative to traditional username/password authentication. This change allows autoremove-torrents to use API tokens for authentication with compatible qBittorrent versions.

Changes

Modified Files

• autoremovetorrents/client/deluge.py: Updated login method to accept optional api_token parameter
• autoremovetorrents/client/qbittorrent.py:
  • Updated login method in both API v1 and API v2 handlers to accept optional api_token parameter
  • Added Bearer token authentication for API v2 (qBittorrent v5.2.0+)
  • Updated login success check to handle API token authentication (which uses server_state() to verify token validity)
• autoremovetorrents/client/transmission.py: Updated login method to accept optional api_token parameter
• autoremovetorrents/client/utorrent.py: Updated login method to accept optional api_token parameter
• autoremovetorrents/task.py:
  • Added support for api_token in configuration (including environment variable replacement)
  • Updated debug logging to include API token
  • Pass api_token to client login method
• docs/config.rst: Updated documentation to include api_token configuration option

Usage Example

my_task:
  client: qbittorrent
  host: http://127.0.0.1:8080
  api_token: your_api_token_here
  strategies:
    my_strategy:
      ratio: 1

Features

• Supports API token authentication for qBittorrent v5.2.0+ (WebAPI v2.14.1+)
• Allows omitting username/password when using API token
• Backward compatible with existing username/password authentication
• Environment variable replacement for api_token (e.g., api_token: $(QBITTORRENT_API_TOKEN))

Testing

Tested with qBittorrent v5.2.0+ using API token authentication and verified backward compatibility with username/password authentication.

Checklist

• Code follows project style
• Backward compatible (no breaking changes to existing functionality)
• Documentation updated
• Tested with real qBittorrent instance