fix: correct positional_encoding_size type from bool to int

[lixiaolei1982]

Description

Fixed incorrect type annotation for positional_encoding_size parameter in Backbone.__init__ method.

Changes Made

• Changed type from bool = False to int = 37
• Matches the expected type in DinoV2 class
• Improves type safety and developer experience

Testing

• All existing tests pass
• Type checkers now validate correctly
• Backward compatible

[Copilot]

Pull request overview

This PR fixes an incorrect type annotation for the positional_encoding_size parameter in the Backbone.__init__ method, changing it from bool = False to int = 37 to match the expected type in the DinoV2 class where it's used in arithmetic operations.

Changes:

• Corrected type annotation from bool to int for positional_encoding_size parameter
• Updated default value from False to 37

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60%. Comparing base (68a9a8c) to head (97140bb).
⚠️ Report is 7 commits behind head on develop.

Additional details and impacted files

@@          Coverage Diff           @@
##           develop   #524   +/-   ##
======================================
  Coverage       60%    60%           
======================================
  Files           55     55           
  Lines         6993   7005   +12     
======================================
+ Hits          4202   4224   +22     
+ Misses        2791   2781   -10     

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