fix: wire agent group selection through to simulation start

Step 2 -> Step 3 -> Simulation API now passes selected_agent_ids.
Backend filters reddit_profiles.json and twitter_profiles.csv
to only include selected agents before starting simulation.

Flow: Step2 checkboxes -> emit('next-step', {selectedAgentIds}) ->
router query -> Step3 props -> startSimulation API -> filter profiles

frontend/src/components/Step2EnvSetup.vue

@@ -834,6 +834,12 @@ const handleStartSimulation = () => {
     addLog(t('log.startSimAutoRounds', { rounds: autoGeneratedRounds.value }))
   }
   
+  // Pass selected agent IDs (filtered by group checkboxes)
+  params.selectedAgentIds = getSelectedAgentIds()
+  if (agentGroups.value.length > 0) {
+    addLog(`✅ ส่ง ${params.selectedAgentIds.length} agents ไปขั้นตอนถัดไป`)
+  }
+  
   emit('next-step', params)
 }
 

frontend/src/components/Step3Simulation.vue

@@ -301,7 +301,8 @@ const { t } = useI18n()
 
 const props = defineProps({
   simulationId: String,
-  maxRounds: Number, // 从Step2传入的最大轮数
+  maxRounds: Number,
+  selectedAgentIds: Array, // Agent IDs selected from Step 2 grouping // 从Step2传入的最大轮数
   minutesPerRound: {
     type: Number,
     default: 30 // 默认每轮30分钟
@@ -407,6 +408,12 @@ const doStartSimulation = async () => {
       addLog(t('log.setMaxRounds', { rounds: props.maxRounds }))
     }
     
+    // Pass selected agent IDs from Step 2 grouping
+    if (props.selectedAgentIds && props.selectedAgentIds.length > 0) {
+      params.selected_agent_ids = props.selectedAgentIds
+      addLog(`✅ ใช้ ${props.selectedAgentIds.length} agents ที่เลือก`)
+    }
+    
     addLog(t('log.graphMemoryUpdateEnabled'))
     
     const res = await startSimulation(params)

frontend/src/views/SimulationRunView.vue

@@ -54,6 +54,7 @@
         <Step3Simulation
           :simulationId="currentSimulationId"
           :maxRounds="maxRounds"
+          :selectedAgentIds="selectedAgentIds"
           :minutesPerRound="minutesPerRound"
           :projectData="projectData"
           :graphData="graphData"
@@ -94,6 +95,7 @@ const viewMode = ref('split')
 const currentSimulationId = ref(route.params.simulationId)
 // 直接在初始化时从 query 参数获取 maxRounds，确保子组件能立即获取到值
 const maxRounds = ref(route.query.maxRounds ? parseInt(route.query.maxRounds) : null)
+const selectedAgentIds = ref(route.query.selectedAgentIds ? route.query.selectedAgentIds.split(',').map(Number) : null)
 const minutesPerRound = ref(30) // 默认每轮30分钟
 const projectData = ref(null)
 const graphData = ref(null)

frontend/src/views/SimulationView.vue

@@ -167,8 +167,15 @@ const handleNextStep = (params = {}) => {
   }
   
   // 如果有自定义轮数，通过 query 参数传递
+  const query = {}
   if (params.maxRounds) {
-    routeParams.query = { maxRounds: params.maxRounds }
+    query.maxRounds = params.maxRounds
+  }
+  if (params.selectedAgentIds && params.selectedAgentIds.length > 0) {
+    query.selectedAgentIds = params.selectedAgentIds.join(',')
+  }
+  if (Object.keys(query).length > 0) {
+    routeParams.query = query
   }
   
   // 跳转到 Step 3 页面