Adaugă funcționalitatea de împărțire a codurilor multiple pentru produse

[dhongu]

Introduce metoda split_multi_codes în modelul product.alternative, care normalizează înregistrările cu multiple coduri alternative. Adaugă o acțiune programată (cron) pentru a automatiza acest proces zilnic și extinde testele pentru a valida funcționalitatea.

[codecov]

Codecov Report

❌ Patch coverage is 96.70330% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.84%. Comparing base (1eb45d6) to head (fe4e97d).

Files with missing lines	Patch %	Lines
deltatech_alternative/models/product.py	78.57%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             18.0    #2471      +/-   ##
==========================================
+ Coverage   72.72%   72.84%   +0.11%     
==========================================
  Files        1229     1230       +1     
  Lines       19908    19999      +91     
  Branches     2800     2806       +6     
==========================================
+ Hits        14479    14569      +90     
  Misses       4626     4626              
- Partials      803      804       +1     

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