Add MRK-S36C device quirk for resistance-level ERG control (#4827)

* Add MRK-S36C device quirk for resistance-level ERG control

The MRK-S36C bike is a generic FTMS device with no matching quirk, so
it defaulted to ergModeSupported=true. When an app targets ERG mode
(SetTargetPower) over Dircon, ftmsbike's power routing only forwards
the request when the bike is non-FTMS or a power sensor is configured,
so the target power request was silently dropped and resistance froze
at its last value instead of following the workout.

Detect the bike by name and force resistance-level mode with
ergModeSupported=false, matching other MRK bikes, so target power is
converted to a resistance level via the erg table instead.

* Add MRK_S36C condition for resistance calculation

Author: cagnulein

src/devices/ftmsbike/ftmsbike.cpp

@@ -354,7 +354,7 @@ void ftmsbike::forceResistance(resistance_t requestResistance) {
                                 QStringLiteral("forceResistance ") + QString::number(requestResistance));
         } else {
             uint8_t write[] = {FTMS_SET_TARGET_RESISTANCE_LEVEL, 0x00};
-            if(_3G_Cardio_RB || SL010)
+            if(_3G_Cardio_RB || SL010 || MRK_S36C)
                 requestResistance = requestResistance * 10;
             write[1] = ((uint8_t)(requestResistance));
             writeCharacteristic(write, sizeof(write),
@@ -2124,6 +2124,11 @@ void ftmsbike::deviceDiscovered(const QBluetoothDeviceInfo &device) {
             qDebug() << QStringLiteral("MRK-S28 found");
             MRK_S28 = true;
             resistance_lvl_mode = true;
+        } else if(device.name().toUpper().startsWith("MRK-S36C-")) {
+            qDebug() << QStringLiteral("MRK-S36C found");
+            MRK_S36C = true;
+            resistance_lvl_mode = true;
+            ergModeSupported = false; // this bike doesn't have ERG mode natively, target power must be converted to resistance
         } else if(device.name().toUpper().startsWith("HAMMER")) {
             qDebug() << QStringLiteral("HAMMER found");
             HAMMER = true;

src/devices/ftmsbike/ftmsbike.h

@@ -199,6 +199,7 @@ class ftmsbike : public bike {
     bool MAGNUS = false;
     bool MRK_S26C = false;
     bool MRK_S28 = false;
+    bool MRK_S36C = false;
     bool HAMMER = false;
     bool YPBM = false;
     bool SPORT01 = false;