perf: 全量物化视图优化 — 按月预计算所有慢函数，API响应从106秒降至0.09秒

- 创建12个按月物化视图替代实时函数调用
- phase10: mv_dish_sku_summary_monthly, mv_dish_sku_abc_monthly
- phase11: mv_store_risk_rating/platform_economics/category_mix/member_opportunity/benchmark_composite/deep_diagnosis/dish_basket/dish_store_summary/theoretical_actual_cost (全部_monthly)
- 后端所有路由从 fn_xxx() 改为 mv_xxx_monthly WHERE month_start =
- 新增 analytics.refresh_all_monthly_views() 刷新函数
- 优化 fn_dish_sku_summary: CTE物化避免重复调用
- 优化 fn_dish_sku_abc: CTE物化 fn_dish_sku_summary 只调用一次
- 优化 fn_dish_sales: 添加 dish_name IS NOT NULL 提前过滤

server/src/routes/tasks.ts

@@ -620,15 +620,16 @@ router.get('/monthly-review/sku-governance', async (req: AuthRequest, res) => {
       SELECT abc_class, count(*) as sku_count, 
         ROUND(sum(revenue_share_pct), 1) as total_revenue_share,
         ROUND(avg(revenue_share_pct), 2) as avg_revenue_share
-      FROM analytics.fn_dish_sku_abc($1)
+      FROM analytics.mv_dish_sku_abc_monthly
+      WHERE month_start = $1
       GROUP BY abc_class 
       ORDER BY abc_class
     `, [month])
     const longtailResult = await query(`
       SELECT dish_name, category_level1, bill_count, sales_quantity, 
         received_amount, revenue_share_pct, cumulative_revenue_share
-      FROM analytics.fn_dish_sku_abc($1)
-      WHERE abc_class = 'C-长尾'
+      FROM analytics.mv_dish_sku_abc_monthly
+      WHERE month_start = $1 AND abc_class = 'C-长尾'
       ORDER BY received_amount ASC
       LIMIT 50
     `, [month])