Address data validity assumption feedback for Bluetooth persistent store

[Copilot]

Responding to feedback on PR #35 regarding validation in BluetoothDeviceManager::updateBluetoothDeviceInfoCache().

Resolution

No code changes required. The current implementation correctly assumes data validity when reading from persistent store:

JsonArray deviceInfoArray;
deviceInfoArray.FromString(bluetoothDeviceInfoStr);

_adminLock.Lock();
_bluetoothDeviceInfoCache.clear();

for (uint16_t i = 0; i < deviceInfoArray.Length(); i++) {
    JsonObject deviceInfoObj = deviceInfoArray[i].Object();
    std::string deviceID = deviceInfoObj["deviceID"].String();
    // ... populate cache directly
}

Since BluetoothDeviceManager is the sole reader/writer of this persistent store namespace, extensive parse/shape validation is unnecessary.

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