Update Step1GraphBuild.vue and Step2EnvSetup.vue with API endpoint notes and enhanced styling

- Added API endpoint notes for simulation creation and preparation in Step1GraphBuild.vue and Step2EnvSetup.vue respectively.
- Updated badge styling for processing state to improve visibility.
- Enhanced the narrative box layout and added a custom checkbox for configuring simulation rounds in Step2EnvSetup.vue.
- Introduced a new section for simulation rounds configuration, including user-defined options and estimated time for completion.

frontend/src/views/MainView.vue

@@ -156,10 +156,15 @@ const toggleMaximize = (target) => {
   }
 }
 
-const handleNextStep = () => {
+const handleNextStep = (params = {}) => {
   if (currentStep.value < 5) {
     currentStep.value++
     addLog(`进入 Step ${currentStep.value}: ${stepNames[currentStep.value - 1]}`)
+    
+    // 如果是从 Step 2 进入 Step 3，记录模拟轮数配置
+    if (currentStep.value === 3 && params.maxRounds) {
+      addLog(`自定义模拟轮数: ${params.maxRounds} 轮`)
+    }
   }
 }