Remove bogus doubled-prefix entry from ai-integrations plugins-list.yaml

[fullsend-ai-triage]

Problem

PR #3548 (auto-generated by update-plugins-repo-refs.yaml) added a bogus entry to workspaces/ai-integrations/plugins-list.yaml (line 7):

plugins/catalog-backend-module-catalog-backend-module-ai-resource-extensions:

The catalog-backend-module- prefix is doubled. The correct entry plugins/catalog-backend-module-ai-resource-extensions: already exists on line 3. The upstream repo contains no directory with the doubled prefix — the /publish workflow silently ignored the non-existent path.

Fix

Remove line 7 (plugins/catalog-backend-module-catalog-backend-module-ai-resource-extensions:) from workspaces/ai-integrations/plugins-list.yaml. The correct entry on line 3 should remain.

Validation

• The file should contain exactly one entry for catalog-backend-module-ai-resource-extensions
• No entry should contain catalog-backend-module-catalog-backend-module

Split from #3555.