revert: hapus integrasi debit air (water flow/volume) pada frontend

lib/features/iot/page/home_page.dart

@@ -2,7 +2,6 @@ import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 import '../../../core/app_theme.dart';
-import '../../../models/monitoring_status.dart';
 import '../../auth/auth_notifier.dart';
 import '../../auth/auth_state.dart';
 import '../providers/monitoring_provider.dart';
@@ -213,41 +212,6 @@ class MonitoringPage extends ConsumerWidget {
 
                     const SizedBox(height: 16),
 
-                    // ── Sensor cards Row 2 (Debit & Volume Air) ───
-                    Row(
-                      children: [
-                        Expanded(
-                          child: MonitoringCard(
-                            value: (monitoring.latest?.waterFlow ?? 0.0).toStringAsFixed(1),
-                            unit: ' L/m',
-                            subtitle: 'Debit Aliran Air',
-                            status: MonitoringStatus.normal,
-                            gradient: const LinearGradient(
-                              colors: [Color(0xFF0288D1), Color(0xFF005691)],
-                              begin: Alignment.topLeft,
-                              end: Alignment.bottomRight,
-                            ),
-                          ),
-                        ),
-                        const SizedBox(width: 16),
-                        Expanded(
-                          child: MonitoringCard(
-                            value: (monitoring.latest?.waterVolume ?? 0.0).toStringAsFixed(1),
-                            unit: ' L',
-                            subtitle: 'Total Volume Air',
-                            status: MonitoringStatus.normal,
-                            gradient: const LinearGradient(
-                              colors: [Color(0xFF00B0FF), Color(0xFF0091EA)],
-                              begin: Alignment.topLeft,
-                              end: Alignment.bottomRight,
-                            ),
-                          ),
-                        ),
-                      ],
-                    ),
-
-                    const SizedBox(height: 16),
-
                     // ── Info Waktu Penyiraman Terbaik & Rentang Aman ──
                     Container(
                       padding: const EdgeInsets.all(16),

lib/features/iot/widgets/monitoring_card.dart

@@ -35,16 +35,9 @@ class MonitoringCard extends StatelessWidget {
   }
 
   IconData get _bgIcon {
-    final sub = subtitle.toLowerCase();
+    return subtitle.toLowerCase().contains('suhu') 
-    if (sub.contains('suhu')) {
+        ? Icons.thermostat 
-      return Icons.thermostat;
+        : Icons.water_drop;
-    } else if (sub.contains('debit') || sub.contains('alir')) {
-      return Icons.waves;
-    } else if (sub.contains('volume') || sub.contains('total')) {
-      return Icons.opacity;
-    } else {
-      return Icons.water_drop;
-    }
   }
 
   @override

lib/models/sensor_model.dart

@@ -1,9 +1,7 @@
-/// Model untuk data sensor IoT (suhu, kelembapan, & debit air).
+/// Model untuk data sensor IoT (suhu & kelembapan).
 class SensorModel {
   final double temperature;
   final double humidity;
-  final double waterFlow;
-  final double waterVolume;
   final bool relayOn;
   final String mode;
   final DateTime timestamp;
@@ -11,8 +9,6 @@ class SensorModel {
   const SensorModel({
     required this.temperature,
     required this.humidity,
-    this.waterFlow = 0.0,
-    this.waterVolume = 0.0,
     this.relayOn = false,
     this.mode = 'auto',
     required this.timestamp,
@@ -22,8 +18,6 @@ class SensorModel {
     return SensorModel(
       temperature: (json['temperature'] as num?)?.toDouble() ?? 0.0,
       humidity: (json['humidity'] as num?)?.toDouble() ?? 0.0,
-      waterFlow: (json['water_flow'] as num?)?.toDouble() ?? 0.0,
-      waterVolume: (json['water_volume'] as num?)?.toDouble() ?? 0.0,
       relayOn: json['relay_state'] as bool? ?? false,
       mode: json['mode'] as String? ?? 'auto',
       timestamp: json['timestamp'] != null
@@ -37,8 +31,6 @@ class SensorModel {
   Map<String, dynamic> toJson() => {
     'temperature': temperature,
     'humidity': humidity,
-    'water_flow': waterFlow,
-    'water_volume': waterVolume,
     'relay_state': relayOn,
     'mode': mode,
     'timestamp': timestamp.toIso8601String(),
@@ -47,8 +39,6 @@ class SensorModel {
   SensorModel copyWith({
     double? temperature,
     double? humidity,
-    double? waterFlow,
-    double? waterVolume,
     bool? relayOn,
     String? mode,
     DateTime? timestamp,
@@ -56,8 +46,6 @@ class SensorModel {
     return SensorModel(
       temperature: temperature ?? this.temperature,
       humidity: humidity ?? this.humidity,
-      waterFlow: waterFlow ?? this.waterFlow,
-      waterVolume: waterVolume ?? this.waterVolume,
       relayOn: relayOn ?? this.relayOn,
       mode: mode ?? this.mode,
       timestamp: timestamp ?? this.timestamp,
@@ -66,5 +54,5 @@ class SensorModel {
 
   @override
   String toString() =>
-      'SensorModel(temp: $temperature°C, hum: $humidity%, flow: $waterFlow L/min, vol: $waterVolume L, relay: $relayOn, mode: $mode, ts: $timestamp)';
+      'SensorModel(temp: $temperature°C, hum: $humidity%, relay: $relayOn, mode: $mode, ts: $timestamp)';
 }