feat(web/route): 支持电脑端鼠标平移画布 & 优化动态SVG宽度

1. 修复电脑端画布无法拖拽滑动问题：
   - 新增 onPanStart/onPanMove/onPanEnd 逻辑
   - 绑定鼠标事件到 .visual-line-container，实现按住左键平移 scrollLeft
2. 修复长线路无法完全滚动的问题：
   - 将固定 100% 的宽度替换为动态宽度计算：Math.max(100, 50 + stations.length * 120 + 50) + px
   - 确保原生 overflow-x: auto 能正确感知超出容器的内部站点
3. 更新静态资源版本号避免缓存

web/ticket-route.js

@@ -497,6 +497,33 @@ createApp({
             await saveDragResult();
         };
 
+        /* 画布平移*/
+        const visualLineContainer = ref(null);
+        const isPanning = ref(false);
+        const panStartX = ref(0);
+        const panScrollLeft = ref(0);
+
+        const onPanStart = (e) => {
+            if (e.button !== 0) return; 
+            if (e.target.closest && e.target.closest('.station-node')) return;
+            isPanning.value = true;
+            panStartX.value = e.clientX;
+            if (visualLineContainer.value) {
+                panScrollLeft.value = visualLineContainer.value.scrollLeft;
+            }
+        };
+
+        const onPanMove = (e) => {
+            if (!isPanning.value || !visualLineContainer.value) return;
+            e.preventDefault(); 
+            const dx = e.clientX - panStartX.value;
+            visualLineContainer.value.scrollLeft = panScrollLeft.value - dx;
+        };
+
+        const onPanEnd = () => {
+            isPanning.value = false;
+        };
+
         /* 订单管理 */
         const fetchOrders = async () => {
             try {
@@ -1032,6 +1059,7 @@ createApp({
             handleStationClick, isStationSelected,
             onStationDragStart, onStationDragOver, onStationDrop, draggingStationIndex,
             onStationTouchStart,
+            visualLineContainer, isPanning, onPanStart, onPanMove, onPanEnd,
             showStationModal, stationForm, stationFormOriginalCode, transferTargets, saveStationSettings, closeStationModal,
             showLineModal, lineForm, openLineModal, saveLineSettings, closeLineModal,