feat: record CW QSOs again

CW was excluded because SmartSDR does not route the operator's own sidetone
through DAX, so the recording sounds one-sided. The audio path is open all the
same and the other station IS captured — which is the half worth keeping.

The frontend had ONE list serving two purposes: which modes may be recorded, and
which modes the voice keyer may transmit on. Adding CW to it would have let the
DVK key the rig with speech on a CW frequency. They are now two lists: PHONE_MODES
for the keyer, RECORDABLE_MODES (phone + CW) for the recorder.

Digital modes stay out of both: their audio is a modem tone nobody will replay.

changelog.json

@@ -3,10 +3,12 @@
     "version": "0.22.4",
     "date": "",
     "en": [
-      "FlexRadio: in split, OpsLog stays on the receive slice instead of following the transmitter."
+      "FlexRadio: in split, OpsLog stays on the receive slice instead of following the transmitter.",
+      "QSO recording works on CW again. Your own sidetone is not in the file, the other station is."
     ],
     "fr": [
-      "FlexRadio : en split, OpsLog reste sur la slice de réception au lieu de suivre l'émission."
+      "FlexRadio : en split, OpsLog reste sur la slice de réception au lieu de suivre l'émission.",
+      "L'enregistrement des QSO fonctionne à nouveau en CW. Votre propre signal d'écoute n'est pas dans le fichier, celui du correspondant l'est."
     ]
   },
   {