fix(core): 代码审查修复 AI 并发/隐私/解析等多处缺陷

- AIRuntime 加 actor 内串行推理闸门,封死 LLM/VL in-flight 并发解码窄口(jetsam OOM 根因)
- prepare 的 .loading 改轮询等待消除假就绪竞态;就绪判据 isReady→isComplete 防半下载崩溃
- applyReanalyzed 重新解读时 unlink 旧 Asset,消除 Vault 孤儿图片(§6 隐私承诺)
- parseReportJSON 改 extractBalancedJSON + 裸数组兜底,防 VL 多项输出被静默截断丢指标
- 临时文件改 completeUnlessOpen 修锁屏写失败;parseDate 支持多格式防归档年份错位
- TimelineEntry/DayDetailSheet 修「偏高」文案与血压箭头方向(偏低指标不再显示相反结论)
- FileVault.wipe 容错;HealthExportSheet 异常关键词排除否定句;modelTag 取实际枚举值
- 删除 B1-B5 + ArchiveFlow 死代码(含违反 §6 的 AES 加密文案)
- 补 3 个回归测试,编译 + 测试全部通过

康康/Features/Trends/DayDetailSheet.swift

@@ -227,7 +227,9 @@ struct DayDetailContent: View {
     }
 
     private func reportRow(_ r: Report) -> some View {
-        let abnormal = r.indicators.filter { $0.status != .normal }.count
+        let highCount = r.indicators.filter { $0.status == .high }.count
+        let lowCount = r.indicators.filter { $0.status == .low }.count
+        let summary = TimelineEntry.abnormalSummary(high: highCount, low: lowCount)
         return HStack(spacing: 12) {
             ZStack {
                 RoundedRectangle(cornerRadius: 8, style: .continuous)
@@ -247,8 +249,8 @@ struct DayDetailContent: View {
                     .foregroundStyle(Tj.Palette.text3)
             }
             Spacer(minLength: 6)
-            if abnormal > 0 {
-                Text("\(abnormal) 项偏高")
+            if let summary {
+                Text(summary)
                     .font(.system(size: 11, weight: .semibold, design: .monospaced))
                     .foregroundStyle(Tj.Palette.brick)
             }