Update the modelConflict / mappingConflict strings (en + zh) to state that model names are matched case-insensitively, so an existing entry (e.g. "GLM-5.2") already covers all case variants and the lowercase variant does not need to be added. This addresses the confusion in #3394 where the rejection of a case-only duplicate looked like inconsistent behavior. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>