Fixing forwards rates

[lsbardel]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 70.66667% with 44 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.67%. Comparing base (2181d94) to head (e5f963e).

Files with missing lines	Patch %	Lines
quantflow/options/surface.py	66.66%	42 Missing ⚠️
quantflow/utils/interest_rates.py	90.90%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
- Coverage   84.21%   83.67%   -0.54%     
==========================================
  Files          57       57              
  Lines        3078     3204     +126     
==========================================
+ Hits         2592     2681      +89     
- Misses        486      523      +37     

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