fix(backend): 财务汇总 500（only_full_group_by 预处理协议回归）+ summary 加 draft_count

- /finance/summary：SEC-001 给 JOIN 加 shop_id 条件后，MySQL 预处理协议推导不出
  p.name 函数依赖 → 1055（文本协议可过，CLI 无法复现）。GROUP BY 补 p.name 修复，
  并给该 handler 加错误日志（此前吞错致排查困难）。v1.0.85 起全店受影响。
- 出入库 summary 新增 draft_count（草稿单数 KPI 卡数据源）。

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JJ1g8XV1YhhmHRzhwWEW7o

backend/internal/handler/finance.go

@@ -1,6 +1,7 @@
 package handler
 
 import (
+	"log"
 	"net/http"
 	"strconv"
 	"time"
@@ -246,9 +247,13 @@ func (h *FinanceHandler) Summary(c *gin.Context) {
 		WHERE f.shop_id = ? AND f.deleted_at IS NULL
 		  AND f.type IN ('payable','receivable')
 		  AND f.status = 'open'
-		GROUP BY f.partner_id, f.type
+		GROUP BY f.partner_id, f.type, p.name
 		ORDER BY total_amount DESC
 	`, shopID).Scan(&rows).Error; err != nil {
+		// p.name 必须入 GROUP BY：JOIN 带 shop_id 条件后，MySQL 预处理协议
+		// 推导不出 p.name 的函数依赖 → only_full_group_by 1055（文本协议却能过，
+		// 故 CLI 直跑无法复现）。p.name 由 partner_id 唯一决定，加入不改分组粒度。
+		log.Printf("finance summary query failed (shop %d): %v", shopID, err)
 		util.RespondError(c, http.StatusInternalServerError, "QUERY_ERROR", "查询失败")
 		return
 	}

backend/internal/handler/stock_in.go

@@ -154,6 +154,7 @@ type stockSummary struct {
 	MonthCount      int64   `json:"month_count"`
 	MonthAmount     float64 `json:"month_amount"`
 	PendingCount    int64   `json:"pending_count"`
+	DraftCount      int64   `json:"draft_count"`
 	LastMonthCount  int64   `json:"last_month_count"`
 	LastMonthAmount float64 `json:"last_month_amount"`
 }
@@ -201,6 +202,8 @@ func (h *StockInHandler) Summary(c *gin.Context) {
 	s.LastMonthCount, s.LastMonthAmount = agg(prevFrom, prevTo)
 	h.db.Model(&model.StockInOrder{}).
 		Where("shop_id = ? AND status = ? AND deleted_at IS NULL", shopID, "pending").Count(&s.PendingCount)
+	h.db.Model(&model.StockInOrder{}).
+		Where("shop_id = ? AND status = ? AND deleted_at IS NULL", shopID, "draft").Count(&s.DraftCount)
 	c.JSON(http.StatusOK, s)
 }
 

backend/internal/handler/stock_out.go

@@ -117,6 +117,8 @@ func (h *StockOutHandler) Summary(c *gin.Context) {
 	s.LastMonthCount, s.LastMonthAmount = agg(prevFrom, prevTo)
 	h.db.Model(&model.StockOutOrder{}).
 		Where("shop_id = ? AND status = ? AND deleted_at IS NULL", shopID, "pending").Count(&s.PendingCount)
+	h.db.Model(&model.StockOutOrder{}).
+		Where("shop_id = ? AND status = ? AND deleted_at IS NULL", shopID, "draft").Count(&s.DraftCount)
 	c.JSON(http.StatusOK, s)
 }