feat(client): 库存查询新增规格/系列/入库时间；筛选组件支持搜索+滚动+标签

- 库存查询加规格、系列服务端筛选（后端 IN 条件，前端从 product-options API 加载全量选项）
- 库存查询新增「入库时间」列，导出 Excel 同步带上
- 入库单商品明细：隐藏商品编码列，生产日期从选填折叠区移至主行常显
- 筛选弹窗重构：顶部搜索框实时过滤 + 滚动列表（ConstrainedBox maxHeight）根治溢出
- 已选项以 Chip 标签置顶展示，每个标签带 × 可单独取消
- FilterableColumnHeader 筛选图标改为常驻，不再需要 hover 才显示

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/internal/handler/import.go

@@ -865,6 +865,7 @@ func parseUploadedExcel(c *gin.Context) ([][]string, error) {
 	if len(rows) < 2 {
 		return nil, fmt.Errorf("empty or invalid sheet")
 	}
+	log.Printf("[import] parseUploadedExcel: file=%s rows=%d (incl. header)", file.Filename, len(rows))
 	return rows, nil
 }
 

backend/internal/handler/inventory.go

@@ -3,6 +3,7 @@ package handler
 import (
 	"net/http"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/gin-gonic/gin"
@@ -63,6 +64,8 @@ func (h *InventoryHandler) List(c *gin.Context) {
 	keyword := c.Query("keyword")
 	warehouseIDStr := c.Query("warehouse_id")
 	inStock := c.Query("in_stock")
+	seriesStr := c.Query("series")
+	specStr := c.Query("spec")
 
 	if keyword != "" {
 		baseWhere += " AND (COALESCE(NULLIF(p.name,''), inv.product_name) LIKE ? OR COALESCE(NULLIF(p.code,''), inv.product_code) LIKE ? OR p.name_pinyin LIKE ? OR p.name_initials LIKE ?)"
@@ -76,6 +79,22 @@ func (h *InventoryHandler) List(c *gin.Context) {
 	if inStock == "1" {
 		baseWhere += " AND inv.quantity > 0"
 	}
+	if seriesStr != "" {
+		parts := strings.Split(seriesStr, ",")
+		placeholders := strings.Repeat("?,", len(parts))
+		baseWhere += " AND COALESCE(NULLIF(p.series,''), inv.series, '') IN (" + placeholders[:len(placeholders)-1] + ")"
+		for _, s := range parts {
+			args = append(args, strings.TrimSpace(s))
+		}
+	}
+	if specStr != "" {
+		parts := strings.Split(specStr, ",")
+		placeholders := strings.Repeat("?,", len(parts))
+		baseWhere += " AND COALESCE(NULLIF(p.spec,''), inv.spec, '') IN (" + placeholders[:len(placeholders)-1] + ")"
+		for _, s := range parts {
+			args = append(args, strings.TrimSpace(s))
+		}
+	}
 
 	// Count query
 	countSQL := `