feat: scan_id를 BLE 로그에도 추가 (CSV와 대조 가능)

- MEASUREMENT scan=3 vol=305.2ml lr=1.20 valid=4/6
- BV_SKIP scan=4 center=2/4 total=2/6
- BV_FAIL scan=5 no valid channels

AdcCsvLogger.lastScanId 공개 → BleDebugLogger에서 참조

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/src/main/java/com/example/medilightv2android/services/AdcCsvLogger.kt

@@ -16,6 +16,8 @@ object AdcCsvLogger {
 
     private val dayFmt = SimpleDateFormat("yyyy-MM-dd", Locale.US)
     private val timeFmt = SimpleDateFormat("HH:mm:ss.SSS", Locale.US)
+    var lastScanId: Int = 0
+        private set
     private var scanCounter = 0
 
     private fun getDir(): File {
@@ -47,6 +49,7 @@ object AdcCsvLogger {
             val file = getTodayFile()
             val isNew = !file.exists() || file.length() == 0L
             scanCounter++
+            lastScanId = scanCounter
 
             val timestamp = timeFmt.format(Date())
             val volStr = volumeMl?.let { "%.1f".format(it) } ?: ""

app/src/main/java/com/example/medilightv2android/services/BleDebugLogger.kt

@@ -156,8 +156,10 @@ class BleDebugLogger private constructor(private val context: Context) {
     }
 
     fun measurementResult(volumeMl: Double?, lrRatio: Double, validChannels: Int, urineLines: List<Int>) {
+        val scanId = AdcCsvLogger.lastScanId
         val msg = buildString {
-            append("MEASUREMENT vol=${volumeMl?.let { "%.1f".format(it) } ?: "null"}ml")
+            append("MEASUREMENT scan=$scanId")
+            append(" vol=${volumeMl?.let { "%.1f".format(it) } ?: "null"}ml")
             append(" lr=${"%.2f".format(lrRatio)}")
             append(" valid=$validChannels/6")
             append(" urine=[${urineLines.joinToString(",")}]")

app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PiezoMonitoringView.kt

@@ -158,7 +158,7 @@ fun PiezoMonitoringView(appState: AppState) {
                         }
                     } else if (centerWallCount > 0) {
                         Log.w("PiezoMonitor", "Insufficient center channels: $centerWallCount/4 (need 3+)")
-                        bleManager.debugLogger.warn("BV_SKIP center=$centerWallCount/4 total=$totalWallCount/6")
+                        bleManager.debugLogger.warn("BV_SKIP scan=${com.example.medilightv2android.services.AdcCsvLogger.lastScanId} center=$centerWallCount/4 total=$totalWallCount/6")
                         com.example.medilightv2android.services.AdcCsvLogger.log(rawADC, null)
                         android.widget.Toast.makeText(context,
                             "측정 부족 (${centerWallCount}/4채널) — 센서 위치를 조절해주세요",
@@ -166,7 +166,7 @@ fun PiezoMonitoringView(appState: AppState) {
                     }
                 } else {
                     Log.d("PiezoMonitor", "No valid channels — volume unchanged")
-                    bleManager.debugLogger.warn("BV_FAIL no valid channels")
+                    bleManager.debugLogger.warn("BV_FAIL scan=${com.example.medilightv2android.services.AdcCsvLogger.lastScanId} no valid channels")
                     val failADC = channels.sortedBy { it.channel }.map { it.buffer }
                     com.example.medilightv2android.services.AdcCsvLogger.log(failADC, null)
                     android.widget.Toast.makeText(context,