[16.0][FIX] connector_lighting_sapb1: convert ibox_volume per SAP SVolUnit

[deeniiz]

The previous code multiplied SVolume by 1000 unconditionally, assuming all products use dm³ (SVolUnit=3). SAP B1 stores volumes in three different units (dm³, cm³, m³), producing 1000× inflated values for the non-dm³ products. SVolUnit is now read from SAP, included in the row hash so existing products are re-imported, and used to pick the correct multiplier into cm³ (the unit of lighting.product.ibox_volume).

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.55%. Comparing base (26b0b02) to head (100453b).
⚠️ Report is 7 commits behind head on 16.0.

Files with missing lines	Patch %	Lines
...ing_sapb1/models/lighting_product/import_mapper.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             16.0      #98      +/-   ##
==========================================
- Coverage   43.60%   43.55%   -0.06%     
==========================================
  Files         283      283              
  Lines        8104     8132      +28     
  Branches     1564     1571       +7     
==========================================
+ Hits         3534     3542       +8     
- Misses       4475     4495      +20     
  Partials       95       95              

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