packages/utils: 删 daysBetween/addDays/isoNow/hmacSha256/renderTemplate(+连带 DAY_MS、createHmac import)
packages/types/canonical-codes: 删 isPACDiagnosisCode/isPACTreatmentCategory/isFDIToothPosition 三个未用 type-guard + RecommendationExtractedBy const/type 别名(保留 Schema)
packages/types/enums: 删 SyncResource、PersonaTriggerSource、HostActionKeySchema、AgentKindSchema、RecallFeedbackTag(均零引用;保留各自仍用的 const)
pac-service: 删 sync-incremental.scheduler 未用 CronExpression import、wrap-openapi 未用 SUCCESS_ENVELOPE_NAME、realtime-provider 未用 RealtimeProviderKey

types/utils build + service/web tsc 全通过。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>