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/iro/chr

@@ -0,0 +1,27 @@
+name Cherokee //https://github.com/espeak-ng/espeak-ng/blob/master/docs/voices.md
+language chr-US-Qaaa-x-west 5
+
+maintainer Michael Conrad <m.conrad.202@gmail.com>
+status testing
+
+pitch 90 160
+
+voicing 100
+
+consonants 100 100
+
+speed 100
+
+words 2 1
+
+phonemes chr
+
+//stress on all syllables to simulate stress on no syllables
+stressRule 9 
+stressLength 175 175 175 175 175 175 175 175 //all vowels the same length regardless of stress
+stressAmp 10 10 10 10 10 10 10 10  //all vowels the same strength regardless of marked stress
+
+intonation 1
+
+tunes	chrs chrc chrq chre
+