chore: add env example and fix default sort order

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

app/api/warehouse/route.ts

@@ -147,8 +147,12 @@ export async function GET(request: NextRequest) {
     const total = countResult.recordset[0].total;
 
     // --- Data query with sorting & pagination ---
-    const sortCol = SORT_MAP[params.sortKey || ""] || "c.总排号";
-    const sortDir = params.sortDir === "desc" ? "DESC" : "ASC";
+    const userSortCol = SORT_MAP[params.sortKey || ""];
+    const userSortDir = params.sortDir === "desc" ? "DESC" : "ASC";
+    // Default multi-column sort: 排产号(车间号) ASC, 总排号 ASC, 箱号 ASC (FR-3)
+    const orderBy = userSortCol
+      ? `${userSortCol} ${userSortDir}`
+      : "c.车间号 ASC, c.总排号 ASC, b.box_no ASC";
     const page = Math.max(1, params.page || 1);
     const pageSize = params.pageSize || 20;
     const offset = (page - 1) * pageSize;
@@ -170,7 +174,7 @@ export async function GET(request: NextRequest) {
           ISNULL(c.经办人, '') AS 经办人,
           ISNULL(c.订单号, '') AS 订单号,
           wh.日期 AS 入库日期,
-          ROW_NUMBER() OVER (ORDER BY ${sortCol} ${sortDir}) AS _rownum
+          ROW_NUMBER() OVER (ORDER BY ${orderBy}) AS _rownum
         ${mainFrom}
         ${where}
       ) numbered