feat: Iteration 3 — 咨询轮询、统计概览、埋点后端

- consultation_service 支持 after_id 增量消息查询
- 小程序咨询详情页 8 秒轮询新消息
- 新增 DashboardStatsResp 综合统计端点 (/statistics/dashboard)
- 新增 /analytics/batch 埋点接收端点（日志记录模式）

crates/erp-health/src/dto/stats_dto.rs

@@ -25,3 +25,11 @@ pub struct FollowUpStatisticsResp {
     pub overdue: i64,
     pub completion_rate: f64,
 }
+
+/// 综合统计概览（一次调用返回全部关键指标）。
+#[derive(Debug, Serialize, Deserialize, ToSchema)]
+pub struct DashboardStatsResp {
+    pub patients: PatientStatisticsResp,
+    pub consultations: ConsultationStatisticsResp,
+    pub follow_ups: FollowUpStatisticsResp,
+}

crates/erp-health/src/handler/consultation_handler.rs

@@ -26,6 +26,7 @@ pub struct SessionListParams {
 pub struct MessageListParams {
     pub page: Option<u64>,
     pub page_size: Option<u64>,
+    pub after_id: Option<Uuid>,
 }
 
 #[derive(Debug, serde::Deserialize, utoipa::ToSchema)]
@@ -114,7 +115,7 @@ where
     let page = params.page.unwrap_or(1);
     let page_size = params.page_size.unwrap_or(20);
     let result = consultation_service::list_messages(
-        &state, ctx.tenant_id, session_id, page, page_size,
+        &state, ctx.tenant_id, session_id, page, page_size, params.after_id,
     )
     .await?;
     Ok(Json(ApiResponse::ok(result)))

crates/erp-health/src/handler/stats_handler.rs

@@ -46,3 +46,22 @@ where
     let result = stats_service::get_follow_up_statistics(&state, ctx.tenant_id).await?;
     Ok(Json(ApiResponse::ok(result)))
 }
+
+pub async fn get_dashboard_stats<S>(
+    State(state): State<HealthState>,
+    Extension(ctx): Extension<TenantContext>,
+) -> Result<Json<ApiResponse<DashboardStatsResp>>, AppError>
+where
+    HealthState: FromRef<S>,
+    S: Clone + Send + Sync + 'static,
+{
+    require_permission(&ctx, "health.patient.list")?;
+    let patients = stats_service::get_patient_statistics(&state, ctx.tenant_id).await?;
+    let consultations = stats_service::get_consultation_statistics(&state, ctx.tenant_id).await?;
+    let follow_ups = stats_service::get_follow_up_statistics(&state, ctx.tenant_id).await?;
+    Ok(Json(ApiResponse::ok(DashboardStatsResp {
+        patients,
+        consultations,
+        follow_ups,
+    })))
+}

crates/erp-health/src/module.rs

@@ -467,6 +467,10 @@ impl HealthModule {
                 "/health/admin/statistics/follow-ups",
                 axum::routing::get(stats_handler::get_follow_up_stats),
             )
+            .route(
+                "/health/admin/statistics/dashboard",
+                axum::routing::get(stats_handler::get_dashboard_stats),
+            )
             // 危急值阈值配置
             .route(
                 "/health/critical-value-thresholds",

crates/erp-health/src/service/consultation_service.rs

@@ -232,15 +232,23 @@ pub async fn list_messages(
     session_id: Uuid,
     page: u64,
     page_size: u64,
+    after_id: Option<Uuid>,
 ) -> HealthResult<PaginatedResponse<MessageResp>> {
     let limit = page_size.min(100);
-    let offset = page.saturating_sub(1) * limit;
 
-    let query = consultation_message::Entity::find()
+    let mut query = consultation_message::Entity::find()
         .filter(consultation_message::Column::TenantId.eq(tenant_id))
         .filter(consultation_message::Column::SessionId.eq(session_id))
         .filter(consultation_message::Column::DeletedAt.is_null());
 
+    // after_id 模式：返回该 ID 之后的所有消息（用于轮询增量拉取）
+    if let Some(aid) = after_id {
+        query = query.filter(consultation_message::Column::Id.gt(aid));
+    }
+
+    let offset = page.saturating_sub(1) * limit;
+    let total = query.clone().count(&state.db).await?;
+
     let total = query.clone().count(&state.db).await?;
     let models = query
         .order_by_asc(consultation_message::Column::CreatedAt)