feat(knowledge): opt-in hybrid lexical + vector retrieval for KB search #24479

Job	Run time
Test and Build / Lint and Test	2m 44s
Test and Build / Build App	3m 11s
Check Docs Changes	0s
Build ARM64 (GHCR Only)	0s
Migrate Dev DB	0s
Build AMD64	0s
Detect Desktop Changes	0s
Detect Version	0s
Build Dev ECR	0s
Check Desktop Signing Secrets	0s
Deploy Trigger.dev (Dev)	0s
Create Desktop Prerelease	0s
Desktop Prerelease Build	0s
Publish Desktop Prerelease	-1s
Prune Desktop Prereleases	-1s
Migrate DB	0s
Promote Images	0s
Process Docs	0s
Create GitHub Release	0s
Create GHCR Manifests	0s
Desktop Release	-1s
	5m 52s

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