feat(admin): implement order management and statistics with real database integration

docs/sql/10_schema/order/ml_orders_schema_update_v1.sql

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+-- =====================================================================================
+-- Schema Update: ml_orders 字段补齐
+-- 位置：docs/sql/10_schema/order/
+-- 对象类型：Schema (ALTER TABLE)
+-- 版本：v1
+-- 说明：为订单主表补齐核销记录 RPC 所依赖的业务字段（order_type, verified_at, verifier_id）
+-- =====================================================================================
+
+DO $$ 
+BEGIN
+    -- 1. 补齐 order_type (1:普通, 2:收银, 3:核销)
+    IF NOT EXISTS (SELECT 1 FROM INFORMATION_SCHEMA.COLUMNS WHERE table_name = 'ml_orders' AND column_name = 'order_type') THEN
+        ALTER TABLE public.ml_orders ADD COLUMN order_type INTEGER DEFAULT 1;
+        COMMENT ON COLUMN public.ml_orders.order_type IS '订单类型: 1:普通, 2:收银, 3:核销';
+    END IF;
+
+    -- 2. 补齐 verified_at (核销时间)
+    IF NOT EXISTS (SELECT 1 FROM INFORMATION_SCHEMA.COLUMNS WHERE table_name = 'ml_orders' AND column_name = 'verified_at') THEN
+        ALTER TABLE public.ml_orders ADD COLUMN verified_at TIMESTAMP WITH TIME ZONE;
+        COMMENT ON COLUMN public.ml_orders.verified_at IS '核销时间';
+    END IF;
+
+    -- 3. 补齐 verifier_id (核销员ID)
+    IF NOT EXISTS (SELECT 1 FROM INFORMATION_SCHEMA.COLUMNS WHERE table_name = 'ml_orders' AND column_name = 'verifier_id') THEN
+        ALTER TABLE public.ml_orders ADD COLUMN verifier_id UUID REFERENCES public.ak_users(id);
+        COMMENT ON COLUMN public.ml_orders.verifier_id IS '核销员ID';
+    END IF;
+
+END $$;