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/AppState.kt

@@ -6,15 +6,14 @@ import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
 import com.medithings.vesiscan.ble.BleManager
-import com.medithings.vesiscan.managers.NirsManager
 import com.medithings.vesiscan.models.*
 import com.medithings.vesiscan.services.*
 
 enum class AppScreen {
     ONBOARDING, CONSENT, REGISTRATION, HOME, SENSOR_SELECT, DEVICE_SCAN,
-    NIRS_CALIBRATION, PIEZO_PERSONALIZATION,
+    PIEZO_PERSONALIZATION,
     PLACEMENT_GUIDE, PIN_SETUP, PIN_ENTRY,
-    VIVAMYO_MONITORING, PIEZO_MONITORING, MEASUREMENT_HISTORY,
+    PIEZO_MONITORING, MEASUREMENT_HISTORY,
     VOIDING_DIARY, URINE_CAMERA, REMINDER_SETTINGS,
     CLINICAL_HOME,      // ★ Dev 모드 한정 — 임상 R&D 측정 세션 화면 (입력 폼)
     CLINICAL_LIVE,      // ★ Dev 모드 한정 — 6채널 라이브 시각화 + Capture
@@ -93,8 +92,6 @@ class AppState(private val context: Context) {
     }
 
     fun goHome() {
-        NirsManager.instance.stopStreaming()
-        NirsManager.instance.reset()
         // 회의 결정: 실제 BLE 연결은 HOME에서도 유지. 다음 Start 시 설정/scan skip하고
         // 바로 PiezoMonitoring으로 진입할 수 있도록.
         // Demo 모드는 가짜 연결이므로 isDeviceConnected reset.
@@ -106,11 +103,7 @@ class AppState(private val context: Context) {
     fun enterDemoMode() {
         isDemoMode = true
         isDeviceConnected = true
-        currentScreen = if (sensorMode == SensorMode.NIRS) {
-            AppScreen.VIVAMYO_MONITORING
-        } else {
-            AppScreen.PIEZO_MONITORING
-        }
+        currentScreen = AppScreen.PIEZO_MONITORING
     }
 
     fun startFromHome() {
@@ -138,15 +131,7 @@ class AppState(private val context: Context) {
             currentScreen = AppScreen.CLINICAL_HOME
             return
         }
-        currentScreen = if (sensorMode == SensorMode.NIRS) {
-            AppScreen.NIRS_CALIBRATION
-        } else {
-            AppScreen.PIEZO_PERSONALIZATION
-        }
-    }
-
-    fun calibrationComplete() {
-        currentScreen = AppScreen.VIVAMYO_MONITORING
+        currentScreen = AppScreen.PIEZO_PERSONALIZATION
     }
 
     fun personalizationComplete() {
@@ -299,7 +284,7 @@ class AppState(private val context: Context) {
     }
 
     fun backToMonitoring() {
-        currentScreen = if (sensorMode == SensorMode.NIRS) AppScreen.VIVAMYO_MONITORING else AppScreen.PIEZO_MONITORING
+        currentScreen = AppScreen.PIEZO_MONITORING
     }
 
     fun addCatheterCount(amount: Int = 1) {