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/zle/be

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+name Belarusian
+language be
+dict_min  2000
+speed 95

tts/piper/espeak-ng-data/lang/zle/ru

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+name Russian
+language ru
+replace 03 a a#
+dict_min  20000

tts/piper/espeak-ng-data/lang/zle/ru-LV

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+name Russian (Latvia)
+language ru-lv 2
+
+maintainer Valdis Vitolins <valdis.vitolins@odo.lv>
+status testing
+
+phonemes ru-lv
+dictrules 2
+dict_min  20000
+speed 95
+
+words 0 2
+tone 150 220 450 255 750 20 3500 255
+stressAmp 12 10 8 8 0 0 16 17
+stressLength 160 140 200 140 0 0 240 160
+

tts/piper/espeak-ng-data/lang/zle/ru-cl

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+name Russian (Classic)
+language ru-cl
+replace 03 a a#
+dict_min  20000
+speed 95
+dictrules 3

tts/piper/espeak-ng-data/lang/zle/uk

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+name Ukrainian
+language uk
+
+maintainer Andrij Mizyk <andm1zyk@proton.me>
+status testing
+
+speed 80