Implements AlertInstanceRepository: save (upsert), findById, findOpenForRule,
listForInbox (3-way OR: user/group/role via && array-overlap + ANY), countUnreadForUser
(LEFT JOIN alert_reads), ack, resolve, markSilenced, deleteResolvedBefore.
Integration test covers all 9 scenarios including inbox fan-out across all
three target types. Also adds @JsonIgnoreProperties(ignoreUnknown=true) to
SilenceMatcher to suppress Jackson serializing isWildcard() as a round-trip field.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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