feat(i18n): replace hardcoded Chinese in frontend views with i18n calls

frontend/src/views/SimulationView.vue

@@ -15,7 +15,7 @@
             :class="{ active: viewMode === mode }"
             @click="viewMode = mode"
           >
-            {{ { graph: '图谱', split: '双栏', workbench: '工作台' }[mode] }}
+            {{ { graph: $t('main.layoutGraph'), split: $t('main.layoutSplit'), workbench: $t('main.layoutWorkbench') }[mode] }}
           </button>
         </div>
       </div>
@@ -25,7 +25,7 @@
         <div class="step-divider"></div>
         <div class="workflow-step">
           <span class="step-num">Step 2/5</span>
-          <span class="step-name">环境搭建</span>
+          <span class="step-name">{{ $tm('main.stepNames')[1] }}</span>
         </div>
         <div class="step-divider"></div>
         <span class="status-indicator" :class="statusClass">