chore(cleanup): NIRS/VIVAMYO 세트 완전 제거 (Category A · 사용자 요청)

배경: NIRS 는 초기 iOS 앱에서 이식했으나 현재 완전 미사용. Piezo 만 실사용.

완전 제거 (6 파일):
  · managers/NirsManager.kt (94 L)
  · managers/NirsCalcEngine.kt (206 L)
  · models/NirsConstants.kt (49 L)
  · models/NirsData.kt (106 L · NirsMcjPacket · NirsMagResponse · NirsOxyResult)
  · ui/views/monitoring/VivamyoMonitoringView.kt (497 L)
  · ui/views/calibration/CalibrationView.kt (216 L) + calibration/ 디렉토리

부분 편집:
  · AppState.kt      — NirsManager import · NIRS_CALIBRATION/VIVAMYO_MONITORING enum ·
                       calibrationComplete() · sensor 분기 3곳 (goHome/enterDemoMode/
                       deviceConnected/backToMonitoring) 모두 PIEZO 로 단순화
  · MainActivity.kt  — CalibrationView/VivamyoMonitoringView import + Crossfade branch +
                       back-handler branch 삭제
  · BleManager.kt    — 콜백 4개 (onNirsPowerOn/SensorActivated/MagReceived/McjReceived) ·
                       sendRawWrite when-branch 4개 · NIRS Commands 섹션 5 함수 ·
                       RX branch 4개 삭제
  · MeasurementService.kt — performNirsMeasurement 제거 · performMeasurement 단순화 ·
                       stop() 콜백 정리 · SensorMode 유지 (센서 추가 대비)
  · SensorMode.kt    — NIRS enum value 삭제 · PIEZO 만 남음 · UserStorage 는
                       valueOf 실패 시 PIEZO fallback 이라 마이그레이션 불필요
  · SensorSelectView.kt — NIRS SensorCard 제거
  · strings.xml × 2  — sensor_nirs_desc · calibration_* 10개 · vivamyo_* 17개 삭제
                       (calibration_continue 는 PiezoPersonalization 사용 → 유지)

합계: 약 1,300 LOC 감소.
빌드: BUILD SUCCESSFUL 17s.

app/src/main/java/com/medithings/vesiscan/ble/BleManager.kt

@@ -287,10 +287,6 @@ class BleManager private constructor(private val context: Context) {
 
     // Callbacks
     var onConnectionStateChanged: ((Boolean) -> Unit)? = null
-    var onNirsPowerOnReceived: (() -> Unit)? = null
-    var onNirsSensorActivated: (() -> Unit)? = null
-    var onNirsMagReceived: ((ByteArray) -> Unit)? = null
-    var onNirsMcjReceived: ((ByteArray) -> Unit)? = null
     var onPiezoDataReceived: ((ByteArray) -> Unit)? = null
     var onUnexpectedDisconnect: (() -> Unit)? = null
     var onReconnectionFailed: (() -> Unit)? = null
@@ -717,10 +713,6 @@ class BleManager private constructor(private val context: Context) {
             "mps" -> "piezo stop"
             "mec" -> "single burst"
             "msn" -> "battery query"
-            "mta" -> if (data.size > 4 && data[4].toInt() == 1) "NIRS power ON" else "NIRS power OFF"
-            "mqq" -> "NIRS activate"
-            "mag" -> "NIRS gain query"
-            "mcj" -> "NIRS MCJ query"
             "mid" -> "device info query"
             // mls 는 buildCommandBE 로 16bit BE 인코딩 → data[4]=High, data[5]=Low
             "mls" -> "LED mode ${
@@ -831,28 +823,6 @@ class BleManager private constructor(private val context: Context) {
         return true
     }
 
-    // ── NIRS Commands ──
-
-    fun sendNirsPowerOn() {
-        sendRaw(CRC16.buildCommandBE("mta", intArrayOf(1)))
-    }
-
-    fun sendNirsPowerOff() {
-        sendRaw(CRC16.buildCommandBE("mta", intArrayOf(0)))
-    }
-
-    fun sendMqqQuery() {
-        sendRaw(CRC16.buildCommandASCII("mqq", " "))
-    }
-
-    fun sendMagQuery() {
-        sendRaw(CRC16.buildCommandASCII("mag", " "))
-    }
-
-    fun sendMcjQuery() {
-        sendRaw(CRC16.buildCommandASCII("mcj", " "))
-    }
-
     // ── Common Commands ──
 
     fun sendBatteryQuery() {
@@ -1644,22 +1614,6 @@ class BleManager private constructor(private val context: Context) {
         val prefix = String(data, 0, minOf(4, data.size), Charsets.US_ASCII)
         logd { "Received: $prefix (${data.size} bytes)" }
         when (prefix) {
-            "rta:", "rta!" -> {
-                debugLogger.rx("rta", data.size, "piezo power ON")
-                onNirsPowerOnReceived?.invoke()
-            }
-            "rsh:", "rsh!", "rqq:", "rqq!" -> {
-                debugLogger.rx(prefix.take(3), data.size, "sensor activated")
-                onNirsSensorActivated?.invoke()
-            }
-            "rag:", "rag!" -> {
-                debugLogger.rx("rag", data.size, "gain calibration (${(data.size - 6) / 2} values)")
-                onNirsMagReceived?.invoke(data)
-            }
-            "rcj:", "rcj!" -> {
-                debugLogger.rx("rcj", data.size, "MCJ packet")
-                onNirsMcjReceived?.invoke(data)
-            }
             "rpa:" -> {
                 debugLogger.rx("rpa", data.size, "piezo ack")
                 onPiezoDataReceived?.invoke(data)