Fix backend API parity: document filters, task days param, i18n locales, contract tests

- Add document list filter support (residence, type, category, contractor, is_active, expiring_soon, search) to handler/service/repo
- Add `days` query param parsing to ListTasks handler (matches ListTasksByResidence)
- Add `error.invalid_token` i18n key to all 9 non-English locale files
- Update contract test to include VerificationResponse mapping

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

internal/i18n/translations/de.json

@@ -7,6 +7,7 @@
   "error.email_already_taken": "E-Mail bereits vergeben",
   "error.registration_failed": "Registrierung fehlgeschlagen",
   "error.not_authenticated": "Nicht authentifiziert",
+  "error.invalid_token": "Ungültiges Token",
   "error.failed_to_get_user": "Benutzer konnte nicht abgerufen werden",
   "error.failed_to_update_profile": "Profil konnte nicht aktualisiert werden",
   "error.invalid_verification_code": "Ungultiger Verifizierungscode",

internal/i18n/translations/es.json

@@ -7,6 +7,7 @@
   "error.email_already_taken": "El correo electronico ya esta en uso",
   "error.registration_failed": "Error en el registro",
   "error.not_authenticated": "No autenticado",
+  "error.invalid_token": "Token no válido",
   "error.failed_to_get_user": "Error al obtener el usuario",
   "error.failed_to_update_profile": "Error al actualizar el perfil",
   "error.invalid_verification_code": "Codigo de verificacion no valido",

internal/i18n/translations/fr.json

@@ -7,6 +7,7 @@
   "error.email_already_taken": "Email deja utilise",
   "error.registration_failed": "Echec de l'inscription",
   "error.not_authenticated": "Non authentifie",
+  "error.invalid_token": "Jeton non valide",
   "error.failed_to_get_user": "Echec de la recuperation de l'utilisateur",
   "error.failed_to_update_profile": "Echec de la mise a jour du profil",
   "error.invalid_verification_code": "Code de verification non valide",

internal/i18n/translations/it.json

@@ -7,6 +7,7 @@
   "error.email_already_taken": "Email già in uso",
   "error.registration_failed": "Registrazione fallita",
   "error.not_authenticated": "Non autenticato",
+  "error.invalid_token": "Token non valido",
   "error.failed_to_get_user": "Impossibile recuperare l'utente",
   "error.failed_to_update_profile": "Impossibile aggiornare il profilo",
   "error.invalid_verification_code": "Codice di verifica non valido",

internal/i18n/translations/ja.json

@@ -7,6 +7,7 @@
   "error.email_already_taken": "このメールアドレスは既に使用されています",
   "error.registration_failed": "登録に失敗しました",
   "error.not_authenticated": "認証されていません",
+  "error.invalid_token": "無効なトークンです",
   "error.failed_to_get_user": "ユーザー情報の取得に失敗しました",
   "error.failed_to_update_profile": "プロフィールの更新に失敗しました",
   "error.invalid_verification_code": "無効な認証コードです",

internal/i18n/translations/ko.json

@@ -7,6 +7,7 @@
   "error.email_already_taken": "이미 사용 중인 이메일입니다",
   "error.registration_failed": "회원가입에 실패했습니다",
   "error.not_authenticated": "인증되지 않았습니다",
+  "error.invalid_token": "유효하지 않은 토큰입니다",
   "error.failed_to_get_user": "사용자 정보를 가져오는데 실패했습니다",
   "error.failed_to_update_profile": "프로필 업데이트에 실패했습니다",
   "error.invalid_verification_code": "유효하지 않은 인증 코드입니다",

internal/i18n/translations/nl.json

@@ -7,6 +7,7 @@
   "error.email_already_taken": "E-mailadres is al in gebruik",
   "error.registration_failed": "Registratie mislukt",
   "error.not_authenticated": "Niet geauthenticeerd",
+  "error.invalid_token": "Ongeldig token",
   "error.failed_to_get_user": "Gebruiker ophalen mislukt",
   "error.failed_to_update_profile": "Profiel bijwerken mislukt",
   "error.invalid_verification_code": "Ongeldige verificatiecode",

internal/i18n/translations/pt.json

@@ -7,6 +7,7 @@
   "error.email_already_taken": "Email ja em uso",
   "error.registration_failed": "Falha no registro",
   "error.not_authenticated": "Nao autenticado",
+  "error.invalid_token": "Token inválido",
   "error.failed_to_get_user": "Falha ao obter usuario",
   "error.failed_to_update_profile": "Falha ao atualizar perfil",
   "error.invalid_verification_code": "Codigo de verificacao invalido",

internal/i18n/translations/zh.json

@@ -7,6 +7,7 @@
   "error.email_already_taken": "邮箱已被占用",
   "error.registration_failed": "注册失败",
   "error.not_authenticated": "未认证",
+  "error.invalid_token": "无效的令牌",
   "error.failed_to_get_user": "获取用户信息失败",
   "error.failed_to_update_profile": "更新个人资料失败",
   "error.invalid_verification_code": "验证码无效",