fix: 修复智能薄壳分析体积减少值显示问题

将volumeReduction字段直接显示，保留6位小数精度

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/components/pages/ShellAnalysisResult.vue

@@ -126,7 +126,7 @@
                 <td>{{ part.id }}</td>
                 <td class="part-name">{{ part.name }}</td>
                 <td class="part-path">{{ part.partPath }}</td>
-                <td class="volume-reduction">{{ formatPercent(part.volumeReduction) }}%</td>
+                <td class="volume-reduction">{{ (part.volumeReduction || 0).toFixed(6) }}%</td>
                 <td class="confidence-value">{{ formatPercent(part.confidence * 100) }}%</td>
                 <td class="reason-text">{{ part.reason }}</td>
                 <td>