feat: CSV에 threshold, dps, sg_filter 컬럼 추가

scan_id,timestamp,volume_ml,lr_ratio,threshold,dps,sg_filter,channel,s0,...
1,14:30:12,305.2,1.20,1150,1.771,ON,CH0,1823,...

매 측정 시점의 설정값이 ADC와 함께 기록되어
추후 분석 시 어떤 파라미터로 측정했는지 추적 가능

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

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

@@ -54,11 +54,14 @@ object AdcCsvLogger {
             val timestamp = timeFmt.format(Date())
             val volStr = volumeMl?.let { "%.1f".format(it) } ?: ""
             val lrStr = "%.2f".format(lrRatio)
+            val thrStr = "%.0f".format(com.example.medilightv2android.managers.GreenZoneConstants.lowEchoAmp)
+            val dpsStr = "%.3f".format(com.example.medilightv2android.managers.PiezoHW.distancePerSample)
+            val sgStr = if (com.example.medilightv2android.managers.PiezoEchoAnalyzer.shared.useSgFilter) "ON" else "OFF"
 
             java.io.FileWriter(file, !isNew).buffered().use { writer ->
                 if (isNew) {
                     val header = buildString {
-                        append("scan_id,timestamp,volume_ml,lr_ratio,channel")
+                        append("scan_id,timestamp,volume_ml,lr_ratio,threshold,dps,sg_filter,channel")
                         for (i in 0 until 100) append(",s$i")
                     }
                     writer.write(header)
@@ -67,7 +70,7 @@ object AdcCsvLogger {
 
                 for ((chIdx, buffer) in channels.withIndex()) {
                     val row = buildString {
-                        append("$scanCounter,$timestamp,$volStr,$lrStr,CH$chIdx")
+                        append("$scanCounter,$timestamp,$volStr,$lrStr,$thrStr,$dpsStr,$sgStr,CH$chIdx")
                         for (sample in buffer) {
                             append(",${sample.toInt()}")
                         }