fix(monitoring): ChannelPanel (dev-mode) METHOD_D 미적용 버그 fix

증상 (사용자 보고 2026-08-04):
  PiezoMonitoring 페이지 · 개발자모드 · 아래 CH0~CH5 차트와 색상(초록/빨강)
  이 Method D 검출과 일치하지 않는다.

원인:
  ChannelPanel (line 2591~) 이 curMethod == METHOD_D 여도 else 분기에서
  legacy `analyzer.analyzeChannel` (V4.1/Method C 스타일) 로 fallback.
  → 실제 BV 계산은 METHOD_D 파이프라인이지만, 화면 표시용 walls 는 legacy 로
     계산되어 시각적 불일치. 사용자가 "D 적용 안됨" 으로 오인.

수정:
  ChannelPanel 두 call site (Zone indicator + 채널 status bar · Per-channel waveform)
  가 공통 helper `analyzeForPanel(chData)` 통과.
  curMethod == METHOD_D 시 MethodDRunner.detectMultichannel 을 6채널 한 번 실행 (재사용).
  결과를 ChannelAnalysisResult (LowEchoResult) 형태로 변환해 legacy caller 와 호환.
  METHOD_A · else (V4.1/METHOD_C) 는 기존 유지.

app/src/main/java/com/medithings/vesiscan/ui/views/monitoring/PiezoMonitoringView.kt

@@ -2589,12 +2589,49 @@ private fun ChannelPanel(
                 // Zone indicator
                 val curMethod = com.medithings.vesiscan.managers.GreenZoneConstants.detectionMethod
                 val analyzerAPanel = com.medithings.vesiscan.managers.PiezoEchoAnalyzerA.shared
-                val analyses = lastMultiChannelResult.map { chData ->
-                    when (curMethod) {
-                        com.medithings.vesiscan.managers.DetectionMethod.METHOD_A -> analyzerAPanel.analyzeChannel(chData.buffer, chData.channel)
-                        else -> analyzer.analyzeChannel(chData.buffer, chData.channel)
+                // 2026-08-04 fix: METHOD_D 선택 시 이 패널도 MethodDRunner 로 동일 walls 계산.
+                //   이전엔 curMethod==METHOD_D 여도 `else -> analyzer.analyzeChannel` (legacy V4.1)
+                //   로 fallback → CH 색상/ant-post 마커가 실제 BV 계산과 다른 detection 을 표시.
+                //   MethodDRunner 는 6채널 함께 계산이 필요하므로 여기서 한 번만 실행 후 재사용.
+                val methodDResults: List<com.medithings.vesiscan.walldetect.MethodDResult?>? =
+                    if (curMethod == com.medithings.vesiscan.managers.DetectionMethod.METHOD_D) {
+                        val signals = (0..5).map { ch ->
+                            lastMultiChannelResult.find { it.channel == ch }
+                                ?.buffer?.map { it.toDouble() }?.toDoubleArray()
+                                ?: DoubleArray(0)
+                        }
+                        if (signals.any { it.isNotEmpty() })
+                            com.medithings.vesiscan.walldetect.MethodDRunner.detectMultichannel(signals)
+                        else null
+                    } else null
+                fun analyzeForPanel(
+                    chData: com.medithings.vesiscan.ble.PiezoChannelData
+                ): com.medithings.vesiscan.managers.ChannelAnalysisResult = when (curMethod) {
+                    com.medithings.vesiscan.managers.DetectionMethod.METHOD_A ->
+                        analyzerAPanel.analyzeChannel(chData.buffer, chData.channel)
+                    com.medithings.vesiscan.managers.DetectionMethod.METHOD_D -> {
+                        val md = methodDResults?.getOrNull(chData.channel)
+                        val bufD = chData.buffer.map { it.toDouble() }.toDoubleArray()
+                        val low = md?.let {
+                            com.medithings.vesiscan.managers.LowEchoResult(
+                                ant = it.ant, post = it.post,
+                                lowStart = it.lowStart, lowEnd = it.lowEnd,
+                                lowMean = it.lowAmp,
+                                urineLen = it.urineLen,
+                                score = 0.0,
+                                innerPeaks = emptyList(),
+                            )
+                        }
+                        com.medithings.vesiscan.managers.ChannelAnalysisResult(
+                            channel = chData.channel,
+                            result = low,
+                            rawSignal = bufD,
+                            denoisedSignal = bufD,
+                        )
                     }
+                    else -> analyzer.analyzeChannel(chData.buffer, chData.channel)
                 }
+                val analyses = lastMultiChannelResult.map { analyzeForPanel(it) }
                 val detectedCount = analyses.count { it.isValid }
                 val zoneColor = when {
                     detectedCount >= 4 -> Color.Green
@@ -2652,10 +2689,7 @@ private fun ChannelPanel(
 
                 // Per-channel waveforms
                 for (chData in lastMultiChannelResult.filter { it.buffer.isNotEmpty() }) {
-                    val chAnalysis = when (curMethod) {
-                        com.medithings.vesiscan.managers.DetectionMethod.METHOD_A -> analyzerAPanel.analyzeChannel(chData.buffer, chData.channel)
-                        else -> analyzer.analyzeChannel(chData.buffer, chData.channel)
-                    }
+                    val chAnalysis = analyzeForPanel(chData)
 
                     // 실제 BV 계산에 사용된 allWalls 값으로 표시
                     val wall = allWalls.getOrNull(chData.channel)