Issue #3579517: Fix clearing index data destroying other indexes' data

m4oliveirequested to merge
issue/ai_provider_amazeeio-3579517:3579517-vdb-clearing-all into 1.3.x

Override deleteAllIndexItems() to delete rows by index_id instead of dropping and recreating the entire collection table, which would destroy data from other indexes sharing the same collection.

Co-Authored-By: Claude Opus 4.6 (1M context) noreply@anthropic.com

Closes #3579517

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