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/inc/as

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+name Assamese
+language as
+
+status testing

tts/piper/espeak-ng-data/lang/inc/bn

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+name Bengali
+language bn

tts/piper/espeak-ng-data/lang/inc/bpy

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+name Bishnupriya Manipuri
+language bpy

tts/piper/espeak-ng-data/lang/inc/gu

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+name Gujarati
+language gu
+
+status testing

tts/piper/espeak-ng-data/lang/inc/hi

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+name Hindi
+language hi

tts/piper/espeak-ng-data/lang/inc/kok

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+name Konkani
+language kok

tts/piper/espeak-ng-data/lang/inc/mr

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+name Marathi
+language mr
+
+status testing

tts/piper/espeak-ng-data/lang/inc/ne

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+name Nepali
+language ne
+
+dictrules 1

tts/piper/espeak-ng-data/lang/inc/or

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+name Oriya
+language or
+
+status testing

tts/piper/espeak-ng-data/lang/inc/pa

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+name Punjabi
+language pa

tts/piper/espeak-ng-data/lang/inc/sd

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+name Sindhi
+language sd
+maintainer Ejaz Shah <eashah67@gmail.com>

tts/piper/espeak-ng-data/lang/inc/si

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+name Sinhala
+language si
+
+status testing
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+intonation 2

tts/piper/espeak-ng-data/lang/inc/ur

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+name Urdu
+language ur
+maintainer Ejaz Shah <eashah67@gmail.com>
+status testing
+
+stressRule 6
+