Rename deprecated api services/service to actions/action

ESPHome renamed the api component's services/service keys to
actions/action; update all devices using the old names.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

mcu-echo.yaml

@@ -22,9 +22,9 @@ packages:
   common: !include common/common.yaml
 
 api:
-  services:
+  actions:
     # https://github.com/granadaxronos/120-SONG_NOKIA_RTTTL_RINGTONE_PLAYER_FOR_ARDUINO_UNO/blob/master/RTTTL_PLAYER/songs.h
-    - service: play_rtttl
+    - action: play_rtttl
       variables:
         song: string
       then: