fix: show env status warning in survey tab + add alert on survey failure

- Add isEnvAlive check on mount via /api/simulation/env-status
- Show warning banner when simulation env is not running
- Add alert() on survey failure for visibility
- Add envNotRunning translation key for th/en/zh

locales/zh.json

@@ -75,7 +75,13 @@
     "layoutGraph": "图谱",
     "layoutSplit": "双栏",
     "layoutWorkbench": "工作台",
-    "stepNames": ["图谱构建", "环境搭建", "开始模拟", "报告生成", "深度互动"]
+    "stepNames": [
+      "图谱构建",
+      "环境搭建",
+      "开始模拟",
+      "报告生成",
+      "深度互动"
+    ]
   },
   "step1": {
     "ontologyGeneration": "本体生成",
@@ -282,7 +288,8 @@
     "errorOccurred": "抱歉，发生了错误: {error}",
     "noResponse": "无响应",
     "requestFailed": "请求失败",
-    "selectAgentFirst": "请先选择一个模拟个体"
+    "selectAgentFirst": "请先选择一个模拟个体",
+    "envNotRunning": "模拟环境未运行。问卷调查需要模拟环境处于运行状态。"
   },
   "graph": {
     "panelTitle": "Graph Relationship Visualization",
@@ -662,4 +669,4 @@
     "generateInterviewQuestionsFailed": "生成采访问题失败: {error}",
     "generateInterviewSummaryFailed": "生成采访摘要失败: {error}"
   }
-}
+}