Enhance simulation preparation process and frontend display for improved user experience

- Added synchronous retrieval of entity count before starting background tasks in simulation.py, allowing immediate access to expected agent totals for the frontend.
- Updated the simulation state to include expected entity count and types, enhancing the information available during preparation.
- Modified Step2EnvSetup.vue to display a pending status when the simulation is in progress and adjusted the simulation rounds configuration to dynamically reflect calculated values.
- Improved the slider for custom rounds to ensure it adapts to the auto-generated maximum rounds, enhancing usability and clarity.

frontend/src/components/Step2EnvSetup.vue

@@ -427,6 +427,7 @@
           </div>
           <div class="step-status">
             <span v-if="phase >= 4" class="badge processing">进行中</span>
+            <span v-else class="badge pending">等待</span>
           </div>
         </div>
 
@@ -434,8 +435,8 @@
           <p class="api-note">POST /api/simulation/start</p>
           <p class="description">模拟环境已准备完成，可以开始运行模拟</p>
           
-          <!-- 模拟轮数配置 -->
-          <div class="rounds-config-section">
+          <!-- 模拟轮数配置 - 只有在配置生成完成且轮数计算出来后才显示 -->
+          <div v-if="simulationConfig && autoGeneratedRounds" class="rounds-config-section">
             <div class="rounds-header">
               <div class="header-left">
                 <span class="section-title">模拟轮数设定</span>
@@ -465,10 +466,10 @@
                     type="range" 
                     v-model.number="customMaxRounds" 
                     min="10" 
-                    max="120" 
+                    :max="autoGeneratedRounds"
                     step="5"
                     class="minimal-slider"
-                    :style="{ '--percent': ((customMaxRounds - 10) / (120 - 10)) * 100 + '%' }"
+                    :style="{ '--percent': ((customMaxRounds - 10) / (autoGeneratedRounds - 10)) * 100 + '%' }"
                   />
                   <div class="range-marks">
                     <span>10</span>
@@ -476,9 +477,9 @@
                       class="mark-recommend" 
                       :class="{ active: customMaxRounds === 40 }"
                       @click="customMaxRounds = 40"
-                      :style="{ position: 'absolute', left: 'calc(27.27% - 30px)' }"
+                      :style="{ position: 'absolute', left: `calc(${(40 - 10) / (autoGeneratedRounds - 10) * 100}% - 30px)` }"
                     >40 (推荐)</span>
-                    <span>120</span>
+                    <span>{{ autoGeneratedRounds }}</span>
                   </div>
                 </div>
               </div>
@@ -665,7 +666,6 @@ const showProfilesDetail = ref(true)
 // 模拟轮数配置
 const useCustomRounds = ref(false) // 默认使用自动配置轮数
 const customMaxRounds = ref(40)   // 默认推荐40轮
-const autoGeneratedRounds = ref(120) // 自动生成的轮数（从配置中读取）
 
 // Watch stage to update phase
 watch(currentStage, (newStage) => {
@@ -683,15 +683,20 @@ watch(currentStage, (newStage) => {
   }
 })
 
-// Watch simulationConfig to update autoGeneratedRounds
-watch(simulationConfig, (newConfig) => {
-  if (newConfig?.time_config) {
-    const totalHours = newConfig.time_config.total_simulation_hours || 120
-    const minutesPerRound = newConfig.time_config.minutes_per_round || 60
-    const calculatedRounds = Math.floor((totalHours * 60) / minutesPerRound)
-    autoGeneratedRounds.value = calculatedRounds || 120
+// 从配置中计算自动生成的轮数（不使用硬编码默认值）
+const autoGeneratedRounds = computed(() => {
+  if (!simulationConfig.value?.time_config) {
+    return null // 配置未生成时返回 null
   }
-}, { immediate: true })
+  const totalHours = simulationConfig.value.time_config.total_simulation_hours
+  const minutesPerRound = simulationConfig.value.time_config.minutes_per_round
+  if (!totalHours || !minutesPerRound) {
+    return null // 配置数据不完整时返回 null
+  }
+  const calculatedRounds = Math.floor((totalHours * 60) / minutesPerRound)
+  // 确保最大轮数不小于40（推荐值），避免滑动条范围异常
+  return Math.max(calculatedRounds, 40)
+})
 
 // Polling timer
 let pollTimer = null
@@ -786,6 +791,12 @@ const startPrepareSimulation = async () => {
       taskId.value = res.data.task_id
       addLog(`准备任务已启动: ${res.data.task_id}`)
       
+      // 立即设置预期Agent总数（从prepare接口返回值获取）
+      if (res.data.expected_entities_count) {
+        expectedTotal.value = res.data.expected_entities_count
+        addLog(`预期Agent总数: ${res.data.expected_entities_count}`)
+      }
+      
       // 开始轮询进度
       startPolling()
       // 开始实时获取 Profiles