feat(ai): Phase 1A 收尾 — 用量记录 + 健康摘要端点 + 小程序组件

- chat_handler 添加 log_usage 精确记录 token 消耗（provider + model）
- SSE build_sse_stream 添加估算 token 用量记录（4 字符 ≈ 1 token）
- 新增 GET /ai/health-summary 端点聚合患者洞察+分析记录
- 小程序 AiHealthSummaryCard 组件（风险等级+洞察统计+摘要列表）
- 小程序 services/ai-analysis 新增 getHealthSummary API

apps/miniprogram/src/components/ui/AiHealthSummaryCard/index.scss

@@ -0,0 +1,100 @@
+.ai-summary-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-bottom: 24px;
+}
+
+.ai-summary-title {
+  font-size: var(--tk-font-size-body-lg, 18px);
+  font-weight: 600;
+  color: var(--tk-color-text, #333);
+}
+
+.ai-summary-risk {
+  padding: 4px 16px;
+  border-radius: 100px;
+
+  &-text {
+    font-size: var(--tk-font-size-cap, 13px);
+    color: #fff;
+    font-weight: 500;
+  }
+}
+
+.ai-summary-insight {
+  margin-bottom: 24px;
+
+  &-label {
+    font-size: var(--tk-font-size-cap, 13px);
+    color: var(--tk-color-text-secondary, #999);
+    display: block;
+    margin-bottom: 8px;
+  }
+
+  &-text {
+    font-size: var(--tk-font-size-body, 16px);
+    color: var(--tk-color-text, #333);
+    line-height: 1.5;
+  }
+}
+
+.ai-summary-stats {
+  display: flex;
+  gap: 40px;
+  margin-bottom: 24px;
+}
+
+.ai-summary-stat {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+
+  &-value {
+    font-size: 28px;
+    font-weight: 700;
+    color: var(--tk-color-primary, #1890ff);
+  }
+
+  &-label {
+    font-size: var(--tk-font-size-cap, 13px);
+    color: var(--tk-color-text-secondary, #999);
+    margin-top: 4px;
+  }
+}
+
+.ai-summary-items {
+  border-top: 1px solid var(--tk-color-border, #f0f0f0);
+  padding-top: 20px;
+}
+
+.ai-summary-item {
+  display: flex;
+  align-items: center;
+  gap: 16px;
+  padding: 12px 0;
+
+  &-dot {
+    width: 8px;
+    height: 8px;
+    border-radius: 50%;
+    flex-shrink: 0;
+  }
+
+  &-title {
+    font-size: var(--tk-font-size-body-sm, 14px);
+    color: var(--tk-color-text, #333);
+    line-height: 1.4;
+  }
+}
+
+.ai-summary-loading {
+  display: flex;
+  justify-content: center;
+  padding: 32px 0;
+
+  &-text {
+    font-size: var(--tk-font-size-body-sm, 14px);
+    color: var(--tk-color-text-secondary, #999);
+  }
+}

apps/miniprogram/src/components/ui/AiHealthSummaryCard/index.tsx

@@ -0,0 +1,97 @@
+import React, { useEffect, useState } from 'react';
+import { View, Text } from '@tarojs/components';
+import ContentCard from '../ContentCard';
+import { getHealthSummary, type HealthSummary } from '../../../services/ai-analysis';
+import './index.scss';
+
+interface AiHealthSummaryCardProps {
+  patientId: string;
+}
+
+const RISK_COLORS: Record<string, string> = {
+  critical: 'var(--tk-color-danger, #ff4d4f)',
+  high: 'var(--tk-color-warning, #faad14)',
+  medium: 'var(--tk-color-info, #1890ff)',
+  low: 'var(--tk-color-success, #52c41a)',
+};
+
+const RISK_LABELS: Record<string, string> = {
+  critical: '高风险',
+  high: '较高风险',
+  medium: '中等风险',
+  low: '低风险',
+};
+
+const AiHealthSummaryCard: React.FC<AiHealthSummaryCardProps> = ({ patientId }) => {
+  const [summary, setSummary] = useState<HealthSummary | null>(null);
+  const [loading, setLoading] = useState(true);
+
+  useEffect(() => {
+    if (!patientId) return;
+    setLoading(true);
+    getHealthSummary(patientId)
+      .then((data) => setSummary(data))
+      .catch(() => setSummary(null))
+      .finally(() => setLoading(false));
+  }, [patientId]);
+
+  if (loading) {
+    return (
+      <ContentCard>
+        <View className='ai-summary-loading'>
+          <Text className='ai-summary-loading-text'>AI 健康摘要加载中...</Text>
+        </View>
+      </ContentCard>
+    );
+  }
+
+  if (!summary) return null;
+
+  const riskColor = RISK_COLORS[summary.risk_level] || RISK_COLORS.low;
+  const riskLabel = RISK_LABELS[summary.risk_level] || '低风险';
+
+  return (
+    <ContentCard>
+      <View className='ai-summary-header'>
+        <Text className='ai-summary-title'>AI 健康摘要</Text>
+        <View className='ai-summary-risk' style={{ backgroundColor: riskColor }}>
+          <Text className='ai-summary-risk-text'>{riskLabel}</Text>
+        </View>
+      </View>
+
+      {summary.latest_insight_title && (
+        <View className='ai-summary-insight'>
+          <Text className='ai-summary-insight-label'>最新洞察</Text>
+          <Text className='ai-summary-insight-text'>{summary.latest_insight_title}</Text>
+        </View>
+      )}
+
+      <View className='ai-summary-stats'>
+        <View className='ai-summary-stat'>
+          <Text className='ai-summary-stat-value'>{summary.active_insights_count}</Text>
+          <Text className='ai-summary-stat-label'>活跃洞察</Text>
+        </View>
+        <View className='ai-summary-stat'>
+          <Text className='ai-summary-stat-value'>{summary.recent_analyses_count}</Text>
+          <Text className='ai-summary-stat-label'>AI 分析</Text>
+        </View>
+      </View>
+
+      {summary.summary_items.length > 0 && (
+        <View className='ai-summary-items'>
+          {summary.summary_items.slice(0, 3).map((item, idx) => (
+            <View key={idx} className='ai-summary-item'>
+              <View
+                className='ai-summary-item-dot'
+                style={{ backgroundColor: item.severity ? (RISK_COLORS[item.severity] || riskColor) : riskColor }}
+              />
+              <Text className='ai-summary-item-title'>{item.title}</Text>
+            </View>
+          ))}
+        </View>
+      )}
+    </ContentCard>
+  );
+};
+
+export default React.memo(AiHealthSummaryCard);

apps/miniprogram/src/services/ai-analysis.ts

@@ -40,3 +40,29 @@ export async function listPendingSuggestions() {
   );
   return resp.data || [];
 }
+
+// === 健康摘要 ===
+
+export interface SummaryItem {
+  category: string;
+  title: string;
+  severity: string | null;
+  created_at: string;
+}
+
+export interface HealthSummary {
+  patient_id: string;
+  risk_level: string;
+  active_insights_count: number;
+  recent_analyses_count: number;
+  latest_insight_title: string | null;
+  latest_analysis_type: string | null;
+  summary_items: SummaryItem[];
+}
+
+export async function getHealthSummary(patientId: string) {
+  return api.get<HealthSummary>(
+    '/ai/health-summary',
+    { patient_id: patientId },
+  );
+}