Agregar campo username a User entity y DTO

- Columna username (unique, nullable) en auth.users
- Campo username en CreateUserDto y UpdateUserDto

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tts/piper/espeak-ng-data/lang/gmw/en-029

@@ -0,0 +1,20 @@
+name English (Caribbean)
+language en-029
+language en 10
+
+maintainer Reece H. Dunn <msclrhd@gmail.com>
+status mature
+
+phonemes en-wi
+dictrules 8
+stressLength 175 175  175 175  220 220  250 290
+
+replace 00 D d
+replace 00 T t[
+replace 00 U@ o@
+replace 03 @ a#
+replace 03 3 a#
+replace 03 N n
+
+formant 1  98  100 100
+formant 2  98  100 100