fix(health): 修复咨询统计返回零值 BUG + 清理 secure-storage 过时注释

BUG-CONSULTATION-001: safe_aggregate 包装导致 compute_avg_response_time
SQL JOIN 错误时整个统计函数返回零值默认。修复方式：
- handler 层移除 safe_aggregate 改为直接 .await?
- service 层对 compute_avg_response_time 独立错误处理（warn + None）

同时清理 secure-storage.ts 中关于 crypto-js 的过时注释（已移除）。

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

@@ -31,11 +31,7 @@ where
     S: Clone + Send + Sync + 'static,
 {
     require_permission(&ctx, "health.consultation.list")?;
-    let result = safe_aggregate(
-        stats_service::get_consultation_statistics(&state, ctx.tenant_id),
-        "咨询统计",
-    )
-    .await;
+    let result = stats_service::get_consultation_statistics(&state, ctx.tenant_id).await?;
     Ok(Json(ApiResponse::ok(result)))
 }
 

crates/erp-health/src/service/stats_service/operations.rs

@@ -86,7 +86,13 @@ pub async fn get_consultation_statistics(
         .count(db)
         .await?;
 
-    let avg_response_time_minutes = compute_avg_response_time(db, tenant_id).await?;
+    let avg_response_time_minutes = match compute_avg_response_time(db, tenant_id).await {
+        Ok(v) => v,
+        Err(e) => {
+            tracing::warn!("咨询平均响应时间查询失败，使用默认值: {e}");
+            None
+        }
+    };
 
     Ok(ConsultationStatisticsResp {
         total_sessions: total_sessions as i64,