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/en.json

@@ -75,7 +75,13 @@
     "layoutGraph": "Graph",
     "layoutSplit": "Split",
     "layoutWorkbench": "Workbench",
-    "stepNames": ["Graph Build", "Env Setup", "Run Simulation", "Report Generation", "Deep Interaction"]
+    "stepNames": [
+      "Graph Build",
+      "Env Setup",
+      "Run Simulation",
+      "Report Generation",
+      "Deep Interaction"
+    ]
   },
   "step1": {
     "ontologyGeneration": "Ontology Generation",
@@ -282,7 +288,8 @@
     "errorOccurred": "Sorry, an error occurred: {error}",
     "noResponse": "No response",
     "requestFailed": "Request failed",
-    "selectAgentFirst": "Please select a simulated individual first"
+    "selectAgentFirst": "Please select a simulated individual first",
+    "envNotRunning": "Simulation environment is not running. Survey requires an active simulation environment."
   },
   "graph": {
     "panelTitle": "Graph Relationship Visualization",
@@ -662,4 +669,4 @@
     "generateInterviewQuestionsFailed": "Failed to generate interview questions: {error}",
     "generateInterviewSummaryFailed": "Failed to generate interview summary: {error}"
   }
-}
+}