* Add supplier information to KiCad part exports
- Include supplier name and part numbers from order details in KiCad exports
- Handle multiple suppliers with sequential numbering (Supplier 2, Supplier 3, etc.)
- Include both active and obsolete order details for comprehensive supplier info
- Add null checks to prevent errors when supplier or part number is missing
* Add SPN suffix to field name
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Co-authored-by: Jan Böhmer <mail@jan-boehmer.de>