docs: add catalog vehicle navigation implementation plan

5-task plan: catalog_service.py, catalog_bp.py rewrite (9 endpoints),
catalog.html + catalog.js rewrite with hierarchical vehicle navigation,
integration test. Performance-optimized for 14B+ vehicle_parts table.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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2026-04-01 21:37:13 +00:00
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commit 4e08e12826

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