Add support for Honor Smart Scale CH100S (#1338)

Add a new BLE handler for the Honor Smart Scale CH100S (Chipsea CST34M97
chipset), which advertises as "CH100S" over Bluetooth.

Protocol details (reverse-engineered from companion app and BLE captures):
- Service 0xFAA0, TX char 0xFAA1 (write), RX char 0xFAA2 (notify)
- Measurement frames arrive as two 16-byte AES-CTR encrypted packets
  (opcodes 0x0E + 0x8E), each decrypted separately with IV reset
- After AES decryption + MAC-XOR deobfuscation, frame layout:
  [userId, weightLE, fatLE, yearLE, month, day, hour, min, sec, dow, impedanceLE]
- USER_INFO (CMD 0x09): MAC-XOR then AES-CTR encrypted, 14-byte payload
- Water%, muscle%, bone mass, BMR, and visceral fat are computed app-side
  from impedance using BIA formulas (EtekcityLib)

Implemented features:
- Weight (LE uint16, tenths of kg)
- Body fat % (from scale, LE uint16, tenths of %)
- Impedance (LE uint16, ohms)
- Timestamp (from scale)
- Body composition (water, muscle, bone, BMR, visceral fat via EtekcityLib)
- Time sync, user sync, history read

Files changed:
- New: HuaweiCH100SHandler.kt
- Modified: ScaleFactory.kt (register new handler)

Author: Piryus

android_app/app/src/main/java/com/health/openscale/core/bluetooth/ScaleFactory.kt

@@ -36,6 +36,7 @@ import com.health.openscale.core.bluetooth.scales.GattScaleAdapter
 import com.health.openscale.core.bluetooth.scales.HesleyHandler
 import com.health.openscale.core.bluetooth.scales.HoffenBbs8107Handler
 import com.health.openscale.core.bluetooth.scales.HuaweiAH100Handler
+import com.health.openscale.core.bluetooth.scales.HuaweiCH100SHandler
 import com.health.openscale.core.bluetooth.scales.IHealthHS3Handler
 import com.health.openscale.core.bluetooth.scales.InlifeHandler
 import com.health.openscale.core.bluetooth.scales.LinkMode
@@ -110,6 +111,7 @@ class ScaleFactory @Inject constructor(
         InlifeHandler(),
         IHealthHS3Handler(),
         HuaweiAH100Handler(),
+        HuaweiCH100SHandler(),
         HoffenBbs8107Handler(),
         HesleyHandler(),
         ExingtechY1Handler(),