feat(透视表): 表格底部增加每列数量合计行

- 每块透视表底部 summary 行，统计各工序列的设备数合计 + 行总计
- 固定底部，方便查看每列总量

frontend/src/pages/MatrixBoard.tsx

@@ -49,7 +49,7 @@ export default function MatrixBoard() {
   const matrixChunks = useMemo(() => {
     const keys = Array.from(new Set(data.map((d) => d.dimension_key)));
     if (keys.length === 0) return [];
-    const chunks: { columns: any[]; dataSource: any[] }[] = [];
+    const chunks: { columns: any[]; dataSource: any[]; keys: string[] }[] = [];
 
     for (let i = 0; i < keys.length; i += CHUNK_MATRIX) {
       const chunkKeys = keys.slice(i, i + CHUNK_MATRIX);
@@ -99,7 +99,7 @@ export default function MatrixBoard() {
         { title: "合计", dataIndex: "row_total", fixed: "right" as const, align: "center" as const, width: 90, render: (v: number) => <span className="font-bold text-blue-600">{v}</span> },
       ];
 
-      chunks.push({ columns, dataSource: Array.from(rowsMap.values()) });
+      chunks.push({ columns, dataSource: Array.from(rowsMap.values()), keys: chunkKeys });
     }
     return chunks;
   }, [data]);
@@ -159,6 +159,29 @@ export default function MatrixBoard() {
                   size="small"
                   pagination={false}
                   scroll={{ x: "max-content" }}
+                  summary={(pageData: readonly any[]) => {
+                    const totals: Record<string, number> = {};
+                    let rowTotal = 0;
+                    for (const row of pageData) {
+                      rowTotal += row.row_total || 0;
+                      for (const k of chunk.keys) totals[k] = (totals[k] || 0) + (row[k] || 0);
+                    }
+                    return (
+                      <Table.Summary fixed>
+                        <Table.Summary.Row>
+                          <Table.Summary.Cell index={0}><span className="font-bold text-gray-800">合计</span></Table.Summary.Cell>
+                          {chunk.keys.map(k => (
+                            <Table.Summary.Cell key={k} index={0} align="center">
+                              <span className="font-semibold text-gray-700">{totals[k] || 0}</span>
+                            </Table.Summary.Cell>
+                          ))}
+                          <Table.Summary.Cell index={0} align="center">
+                            <span className="font-bold text-blue-600">{rowTotal}</span>
+                          </Table.Summary.Cell>
+                        </Table.Summary.Row>
+                      </Table.Summary>
+                    );
+                  }}
                 />
               </div>
             </div>