Prevent duplicate customers on create and update

Adds CustomerRepository::findDuplicate() which checks for an existing record with the same customer_type_id and attribute_values before any write. The update path excludes the current record so saving without changes does not trigger a false positive. Both the create and edit forms now display a linked error banner identifying the conflicting customer by ID and type name.

dcovington viittasi tähän ongelmaan commitissa 2 viikkoa sitten

Merge pull request 'Prevent duplicate customers on create and update' (#4) from Unique_Attribute into main

dcovington suljettu 2 viikkoa sitten

dcovington deleted branch Unique_Attribute 2 viikkoa sitten

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#4 Prevent duplicate customers on create and update