- Update VendorResponse to use company_id instead of owner fields
- Add VendorDetailResponse with company info (name, email, phone, website)
- Update VendorCreate to require company_id
- Add owner_email, owner_username, vendors list to CompanyDetailResponse
- Remove obsolete VendorTransferOwnership schemas
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Co-Authored-By: Claude <noreply@anthropic.com>
- Add database migration to make vendor.owner_user_id nullable
- Update Vendor model to support company-based ownership (DEPRECATED vendor.owner_user_id)
- Implement company_service with singleton pattern (consistent with vendor_service)
- Create Company model with proper relationships to vendors and users
- Add company exception classes for proper error handling
- Refactor companies API to use singleton service pattern
Architecture Change:
- OLD: Each vendor has its own owner (vendor.owner_user_id)
- NEW: Vendors belong to a company, company has one owner (company.owner_user_id)
- This allows one company owner to manage multiple vendor brands
Technical Details:
- Company service uses singleton pattern (not factory)
- Company service accepts db: Session as parameter (follows SVC-003)
- Uses AuthManager for password hashing (consistent with admin_service)
- Added _generate_temp_password() helper method
