feat: torrent scheme system handle

[monkeyWie]

1. Support open magnet: scheme uri directly with Gopeed.
2. Support open .torrent file directly with Gopeed.

[codecov]

Codecov Report

Attention: Patch coverage is 70.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 59.61%. Comparing base (ccb3267) to head (629a53c).

Files with missing lines	Patch %	Lines
internal/protocol/bt/fetcher.go	62.50%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #866      +/-   ##
==========================================
+ Coverage   59.58%   59.61%   +0.03%     
==========================================
  Files          36       36              
  Lines        4513     4519       +6     
==========================================
+ Hits         2689     2694       +5     
  Misses       1549     1549              
- Partials      275      276       +1     

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