docs: reorganize MVP interview documentation

mvp/demo/scripts/run-payment-timeout-demo.ps1

@@ -13,7 +13,7 @@ $request = Get-Content -Raw -Encoding UTF8 -Path $RequestFile | ConvertFrom-Json
 $request.Id = $SessionId
 $body = $request | ConvertTo-Json -Depth 8
 
-Write-Host "Running payment-timeout chat demo..."
+Write-Host "正在运行支付超时 Chat 诊断 Demo..."
 Write-Host "BaseUrl: $BaseUrl"
 Write-Host "SessionId: $SessionId"
 
@@ -24,14 +24,14 @@ $chat = Invoke-RestMethod `
     -Body $body
 
 $chat | ConvertTo-Json -Depth 20 | Set-Content -Encoding UTF8 -Path "$OutputDir/chat-response.json"
-Write-Host "Saved chat response: $OutputDir/chat-response.json"
+Write-Host "已保存 Chat 响应: $OutputDir/chat-response.json"
 
 $trace = Invoke-RestMethod `
     -Method Get `
     -Uri "$BaseUrl/api/diagnosis/$SessionId/trace"
 
 $trace | ConvertTo-Json -Depth 50 | Set-Content -Encoding UTF8 -Path "$OutputDir/trace-response.json"
-Write-Host "Saved trace response: $OutputDir/trace-response.json"
+Write-Host "已保存 Trace 响应: $OutputDir/trace-response.json"
 
 $feedbackBody = @{
     sessionId = $SessionId
@@ -45,10 +45,10 @@ $feedback = Invoke-RestMethod `
     -Body $feedbackBody
 
 $feedback | ConvertTo-Json -Depth 20 | Set-Content -Encoding UTF8 -Path "$OutputDir/feedback-response.json"
-Write-Host "Saved feedback response: $OutputDir/feedback-response.json"
+Write-Host "已保存反馈响应: $OutputDir/feedback-response.json"
 
 Write-Host ""
-Write-Host "Demo completed. Review:"
+Write-Host "Demo 已完成，请检查:"
 Write-Host "- mvp/demo/output/chat-response.json"
 Write-Host "- mvp/demo/output/trace-response.json"
 Write-Host "- mvp/demo/output/feedback-response.json"