feat: 数据概览/操作日志/批量操作 + 首页合格档案数

后台新增「数据概览」(商品/合格/按状态/品牌/分类/待审核) 与「操作日志」(全局审计分页)；商品列表支持多选批量改状态/分类。公开首页标题改为「天工」并展示合格档案数；新增公开接口 /api/v1/stats 与后台 /api/stats、/api/audit、/api/products/bulk。合格口径=quality_score≥0.6 且在用。

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

api/internal/adminstore/bulk.go

@@ -0,0 +1,80 @@
+package adminstore
+
+import (
+	"context"
+	"errors"
+)
+
+// Bulk-operation errors.
+var (
+	// ErrNoTargets is returned when a bulk request selects no products.
+	ErrNoTargets = errors.New("no products selected")
+	// ErrInvalidStatus is returned for an unknown product status value.
+	ErrInvalidStatus = errors.New("invalid status")
+)
+
+var validStatus = map[string]bool{"active": true, "merged": true, "deprecated": true}
+
+// BulkSetStatus updates the status of every selected product in one statement.
+func (s *Store) BulkSetStatus(ctx context.Context, actor string, ids []string, status string) (int, error) {
+	if len(ids) == 0 {
+		return 0, ErrNoTargets
+	}
+	if !validStatus[status] {
+		return 0, ErrInvalidStatus
+	}
+	ct, err := s.pool.Exec(ctx,
+		"UPDATE product SET status = $1 WHERE id = ANY($2)", status, ids)
+	if err != nil {
+		return 0, err
+	}
+	n := int(ct.RowsAffected())
+	_ = s.writeAudit(ctx, actor, "bulk_status", "product", nil,
+		[]string{"status"}, map[string]any{"ids": ids}, map[string]any{"status": status})
+	return n, nil
+}
+
+// BulkSetCategory reassigns the category of every selected product, syncing the
+// GPC brick code and recomputing quality for each one.
+func (s *Store) BulkSetCategory(ctx context.Context, actor string, ids []string, categoryID *string) (int, error) {
+	if len(ids) == 0 {
+		return 0, ErrNoTargets
+	}
+	tx, err := s.pool.Begin(ctx)
+	if err != nil {
+		return 0, err
+	}
+	defer tx.Rollback(ctx)
+
+	var gpc *string
+	if categoryID != nil && *categoryID != "" {
+		if err := tx.QueryRow(ctx, "SELECT gpc_brick_code FROM category WHERE id = $1", *categoryID).Scan(&gpc); err != nil {
+			return 0, ErrInvalidParent
+		}
+	} else {
+		categoryID = nil
+	}
+
+	ct, err := tx.Exec(ctx,
+		"UPDATE product SET category_id = $1, gpc_brick_code = $2 WHERE id = ANY($3)",
+		categoryID, gpc, ids)
+	if err != nil {
+		return 0, err
+	}
+	for _, id := range ids {
+		if _, err := s.recomputeQualityTx(ctx, tx, id); err != nil {
+			return 0, err
+		}
+	}
+	if err := tx.Commit(ctx); err != nil {
+		return 0, err
+	}
+	n := int(ct.RowsAffected())
+	cat := ""
+	if categoryID != nil {
+		cat = *categoryID
+	}
+	_ = s.writeAudit(ctx, actor, "bulk_category", "product", nil,
+		[]string{"category"}, map[string]any{"ids": ids}, map[string]any{"category_id": cat})
+	return n, nil
+}