OlgunR 904e6e20f0 Enforce unique catalog titles on creation ...

Added a uniqueness check for catalog titles in the creation flow. The service now prevents creating catalogs with duplicate titles by checking for existing entries before insertion. If a duplicate is detected, the API returns a 409 Conflict response. Updated interfaces and repository to support title-based lookups.

2026-01-16 13:42:46 +01:00

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