v0.12.0

Changelog

• 12d9013 chore: bump version to v0.12.0
• 3fe2c24 chore: go mod tidy after adding golang.org/x/crypto
• 4e2be7c feat(auth): enterprise multi-user auth system
• 143f4dc feat(auth): separate admin/user login paths, user portal, fix non-admin change-password
• 38e3291 feat(users): soft-delete, reset password, live key/model selectors in approve modal
• 1847b9f fix(fmt): gofmt internal/store/store.go
• 17c7df4 fix(security): bcrypt passwords, DB-backed admin auth, SQLite schema hardening
• f6096fe fixed indentations
• 080e114 style: optimize landing page scheduler console for mobile viewports