feat(database): brownfield support — introspector, drift detection, db CLI#356

Draft

ditadi wants to merge 9 commits intostack/database/serverfrom

stack/database/brownfield

Commits on May 7, 2026

feat(database): add introspector engine with drizzle adapter
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feat(cli): add appkit db introspect/generate/migrate/verify
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feat(database): boot-time drift detection
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fix(database): only fail prod boot on fatal drift, warn on live-only
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feat(database): brownfield polish - lock, drift transient, schema name, drift help dedup
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fix(database): drift fail-closed; harden render; healthz saturation; pg→http mapping
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refactor(database): type LakebasePool, add withLakebasePool, dedupe schema loader
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feat(cli): add db setup:dev, seed, and migration commands
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fix(database): make introspect -> verify roundtrip drift-free
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