Add Google OAuth authentication support

- Add Google OAuth token verification and user lookup/creation
- Add GoogleAuthRequest and GoogleAuthResponse DTOs
- Add GoogleLogin handler in auth_handler.go
- Add google_auth.go service for token verification
- Add FindByGoogleID repository method for user lookup
- Add GoogleID field to User model
- Add Google OAuth configuration (client ID, enabled flag)
- Add i18n translations for Google auth error messages
- Add Google verification email template support

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

internal/i18n/translations/de.json

@@ -21,6 +21,9 @@
   "error.apple_signin_not_configured": "Apple-Anmeldung ist nicht konfiguriert",
   "error.apple_signin_failed": "Apple-Anmeldung fehlgeschlagen",
   "error.invalid_apple_token": "Ungultiger Apple-Identitats-Token",
+  "error.google_signin_not_configured": "Google-Anmeldung ist nicht konfiguriert",
+  "error.google_signin_failed": "Google-Anmeldung fehlgeschlagen",
+  "error.invalid_google_token": "Ungultiger Google-Identitats-Token",
 
   "error.invalid_task_id": "Ungultige Aufgaben-ID",
   "error.invalid_residence_id": "Ungultige Immobilien-ID",

internal/i18n/translations/en.json

@@ -21,6 +21,9 @@
   "error.apple_signin_not_configured": "Apple Sign In is not configured",
   "error.apple_signin_failed": "Apple Sign In failed",
   "error.invalid_apple_token": "Invalid Apple identity token",
+  "error.google_signin_not_configured": "Google Sign In is not configured",
+  "error.google_signin_failed": "Google Sign In failed",
+  "error.invalid_google_token": "Invalid Google identity token",
 
   "error.invalid_task_id": "Invalid task ID",
   "error.invalid_residence_id": "Invalid residence ID",

internal/i18n/translations/es.json

@@ -21,6 +21,9 @@
   "error.apple_signin_not_configured": "El inicio de sesion con Apple no esta configurado",
   "error.apple_signin_failed": "Error en el inicio de sesion con Apple",
   "error.invalid_apple_token": "Token de identidad de Apple no valido",
+  "error.google_signin_not_configured": "El inicio de sesion con Google no esta configurado",
+  "error.google_signin_failed": "Error en el inicio de sesion con Google",
+  "error.invalid_google_token": "Token de identidad de Google no valido",
 
   "error.invalid_task_id": "ID de tarea no valido",
   "error.invalid_residence_id": "ID de propiedad no valido",

internal/i18n/translations/fr.json

@@ -21,6 +21,9 @@
   "error.apple_signin_not_configured": "La connexion Apple n'est pas configuree",
   "error.apple_signin_failed": "Echec de la connexion Apple",
   "error.invalid_apple_token": "Jeton d'identite Apple non valide",
+  "error.google_signin_not_configured": "La connexion Google n'est pas configuree",
+  "error.google_signin_failed": "Echec de la connexion Google",
+  "error.invalid_google_token": "Jeton d'identite Google non valide",
 
   "error.invalid_task_id": "ID de tache non valide",
   "error.invalid_residence_id": "ID de propriete non valide",

internal/i18n/translations/it.json

@@ -21,6 +21,9 @@
   "error.apple_signin_not_configured": "L'accesso con Apple non è configurato",
   "error.apple_signin_failed": "Accesso con Apple fallito",
   "error.invalid_apple_token": "Token di identità Apple non valido",
+  "error.google_signin_not_configured": "L'accesso con Google non è configurato",
+  "error.google_signin_failed": "Accesso con Google fallito",
+  "error.invalid_google_token": "Token di identità Google non valido",
 
   "error.invalid_task_id": "ID attività non valido",
   "error.invalid_residence_id": "ID immobile non valido",

internal/i18n/translations/ja.json

@@ -21,6 +21,9 @@
   "error.apple_signin_not_configured": "Apple サインインが設定されていません",
   "error.apple_signin_failed": "Apple サインインに失敗しました",
   "error.invalid_apple_token": "無効な Apple ID トークンです",
+  "error.google_signin_not_configured": "Google サインインが設定されていません",
+  "error.google_signin_failed": "Google サインインに失敗しました",
+  "error.invalid_google_token": "無効な Google ID トークンです",
 
   "error.invalid_task_id": "無効なタスクIDです",
   "error.invalid_residence_id": "無効な物件IDです",

internal/i18n/translations/ko.json

@@ -21,6 +21,9 @@
   "error.apple_signin_not_configured": "Apple 로그인이 설정되지 않았습니다",
   "error.apple_signin_failed": "Apple 로그인에 실패했습니다",
   "error.invalid_apple_token": "유효하지 않은 Apple 인증 토큰입니다",
+  "error.google_signin_not_configured": "Google 로그인이 설정되지 않았습니다",
+  "error.google_signin_failed": "Google 로그인에 실패했습니다",
+  "error.invalid_google_token": "유효하지 않은 Google 인증 토큰입니다",
 
   "error.invalid_task_id": "유효하지 않은 작업 ID입니다",
   "error.invalid_residence_id": "유효하지 않은 주거지 ID입니다",

internal/i18n/translations/nl.json

@@ -21,6 +21,9 @@
   "error.apple_signin_not_configured": "Apple Sign In is niet geconfigureerd",
   "error.apple_signin_failed": "Apple Sign In mislukt",
   "error.invalid_apple_token": "Ongeldig Apple identiteitstoken",
+  "error.google_signin_not_configured": "Google Sign In is niet geconfigureerd",
+  "error.google_signin_failed": "Google Sign In mislukt",
+  "error.invalid_google_token": "Ongeldig Google identiteitstoken",
 
   "error.invalid_task_id": "Ongeldig taak-ID",
   "error.invalid_residence_id": "Ongeldig woning-ID",

internal/i18n/translations/pt.json

@@ -21,6 +21,9 @@
   "error.apple_signin_not_configured": "O login com Apple nao esta configurado",
   "error.apple_signin_failed": "Falha no login com Apple",
   "error.invalid_apple_token": "Token de identidade Apple invalido",
+  "error.google_signin_not_configured": "O login com Google nao esta configurado",
+  "error.google_signin_failed": "Falha no login com Google",
+  "error.invalid_google_token": "Token de identidade Google invalido",
 
   "error.invalid_task_id": "ID da tarefa invalido",
   "error.invalid_residence_id": "ID da propriedade invalido",

internal/i18n/translations/zh.json

@@ -21,6 +21,9 @@
   "error.apple_signin_not_configured": "未配置 Apple 登录",
   "error.apple_signin_failed": "Apple 登录失败",
   "error.invalid_apple_token": "Apple 身份令牌无效",
+  "error.google_signin_not_configured": "未配置 Google 登录",
+  "error.google_signin_failed": "Google 登录失败",
+  "error.invalid_google_token": "Google 身份令牌无效",
 
   "error.invalid_task_id": "任务 ID 无效",
   "error.invalid_residence_id": "房产 ID 无效",