fix: 关系图谱工具条移除适配画布按钮

按需求移除适配画布入口；右键菜单的适配视图和全屏切换后的自动适配保持不变。

ai-electron/frontend/src/ai/components/graph/GraphAnalysisViewer.vue

@@ -188,12 +188,6 @@
                 <AimOutlined />
               </Button>
             </Tooltip>
-            <Tooltip title="适配画布">
-              <Button type="text" class="canvas-toolbar__button" @click="fitView">
-                <ScanOutlined />
-              </Button>
-            </Tooltip>
-            <span class="canvas-toolbar__divider"></span>
             <Tooltip title="全屏查看">
               <Button type="text" class="canvas-toolbar__button" @click="emit('toggle-fullscreen')">
                 <FullscreenOutlined />
@@ -298,7 +292,6 @@
     ApartmentOutlined,
     FilterOutlined,
     FullscreenOutlined,
-    ScanOutlined,
     SearchOutlined,
     ShareAltOutlined,
   } from '@ant-design/icons-vue';