feat: multi-module improvements across merchant, store, i18n, and customer systems

- Fix platform-grouped merchant sidebar menu with core items at root level
- Add merchant store management (detail page, create store, team page)
- Fix store settings 500 error by removing dead stripe/API tab
- Move onboarding translations to module-owned locale files
- Fix onboarding banner i18n with server-side rendering + context inheritance
- Refactor login language selectors to use languageSelector() function (LANG-002)
- Move HTTPException handling to global exception handler in merchant routes (API-003)
- Add language selector to all login pages and portal headers
- Fix customer module: drop order stats from customer model, add to orders module
- Fix admin menu config visibility for super admin platform context
- Fix storefront auth and layout issues
- Add missing i18n translations for onboarding steps (en/fr/de/lb)

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

static/locales/de.json

@@ -111,7 +111,35 @@
     "invalid_credentials": "Ungültiger Benutzername oder Passwort",
     "session_expired": "Ihre Sitzung ist abgelaufen. Bitte melden Sie sich erneut an.",
     "account_locked": "Ihr Konto wurde gesperrt",
-    "account_inactive": "Ihr Konto ist inaktiv"
+    "account_inactive": "Ihr Konto ist inaktiv",
+    "signing_in": "Anmeldung läuft...",
+    "sending": "Wird gesendet...",
+    "send_reset_link": "Link zum Zurücksetzen senden",
+    "reset_password_desc": "Geben Sie Ihre E-Mail-Adresse ein und wir senden Ihnen einen Link zum Zurücksetzen Ihres Passworts.",
+    "back_to_login": "Zurück zur Anmeldung",
+    "back_to_platform": "Zurück zur Plattform",
+    "no_account": "Noch kein Konto?",
+    "visit_platform": "Besuchen Sie unsere Plattform",
+    "already_have_account": "Haben Sie bereits ein Konto?",
+    "create_account": "Konto erstellen",
+    "continue_shopping": "Weiter einkaufen",
+    "admin_login": "Admin-Anmeldung",
+    "merchant_login": "Händler-Anmeldung",
+    "store_login": "Shop-Portal-Anmeldung",
+    "customer_login": "Kunden-Anmeldung",
+    "create_account_title": "Konto erstellen",
+    "creating_account": "Konto wird erstellt...",
+    "sign_in_instead": "Stattdessen anmelden",
+    "first_name": "Vorname",
+    "last_name": "Nachname",
+    "phone_number": "Telefonnummer",
+    "marketing_consent": "Ich möchte Neuigkeiten und Sonderangebote erhalten",
+    "password_requirements": "Muss mindestens 8 Zeichen, einen Buchstaben und eine Zahl enthalten",
+    "check_email": "Überprüfen Sie Ihre E-Mail",
+    "reset_link_sent": "Wir haben einen Link zum Zurücksetzen des Passworts an Ihre E-Mail-Adresse gesendet. Bitte überprüfen Sie Ihren Posteingang und klicken Sie auf den Link.",
+    "didnt_receive_email": "E-Mail nicht erhalten? Überprüfen Sie Ihren Spam-Ordner oder",
+    "try_again": "versuchen Sie es erneut",
+    "remember_password": "Passwort wieder eingefallen?"
   },
   "nav": {
     "dashboard": "Dashboard",
@@ -191,5 +219,11 @@
     "time": "HH:mm",
     "datetime": "DD.MM.YYYY HH:mm",
     "currency": "{amount} {symbol}"
+  },
+  "onboarding": {
+    "banner": {
+      "title": "Erste Schritte",
+      "dismiss": "Ausblenden"
+    }
   }
 }

static/locales/en.json

@@ -111,7 +111,35 @@
     "invalid_credentials": "Invalid username or password",
     "session_expired": "Your session has expired. Please login again.",
     "account_locked": "Your account has been locked",
-    "account_inactive": "Your account is inactive"
+    "account_inactive": "Your account is inactive",
+    "signing_in": "Signing in...",
+    "sending": "Sending...",
+    "send_reset_link": "Send Reset Link",
+    "reset_password_desc": "Enter your email address and we'll send you a link to reset your password.",
+    "back_to_login": "Back to Login",
+    "back_to_platform": "Back to Platform",
+    "no_account": "Don't have an account?",
+    "visit_platform": "Visit our platform",
+    "already_have_account": "Already have an account?",
+    "create_account": "Create an account",
+    "continue_shopping": "Continue shopping",
+    "admin_login": "Admin Login",
+    "merchant_login": "Merchant Login",
+    "store_login": "Store Portal Login",
+    "customer_login": "Customer Login",
+    "create_account_title": "Create Account",
+    "creating_account": "Creating account...",
+    "sign_in_instead": "Sign in instead",
+    "first_name": "First Name",
+    "last_name": "Last Name",
+    "phone_number": "Phone Number",
+    "marketing_consent": "I'd like to receive news and special offers",
+    "password_requirements": "Must contain at least 8 characters, one letter, and one number",
+    "check_email": "Check Your Email",
+    "reset_link_sent": "We've sent a password reset link to your email. Please check your inbox and click the link to reset your password.",
+    "didnt_receive_email": "Didn't receive the email? Check your spam folder or",
+    "try_again": "try again",
+    "remember_password": "Remember your password?"
   },
   "nav": {
     "dashboard": "Dashboard",
@@ -195,5 +223,11 @@
   "clipboard": {
     "copied": "Copied to clipboard",
     "failed": "Failed to copy"
+  },
+  "onboarding": {
+    "banner": {
+      "title": "Get Started",
+      "dismiss": "Dismiss"
+    }
   }
 }

static/locales/fr.json

@@ -111,7 +111,35 @@
     "invalid_credentials": "Nom d'utilisateur ou mot de passe invalide",
     "session_expired": "Votre session a expiré. Veuillez vous reconnecter.",
     "account_locked": "Votre compte a été verrouillé",
-    "account_inactive": "Votre compte est inactif"
+    "account_inactive": "Votre compte est inactif",
+    "signing_in": "Connexion en cours...",
+    "sending": "Envoi en cours...",
+    "send_reset_link": "Envoyer le lien de réinitialisation",
+    "reset_password_desc": "Entrez votre adresse e-mail et nous vous enverrons un lien pour réinitialiser votre mot de passe.",
+    "back_to_login": "Retour à la connexion",
+    "back_to_platform": "Retour à la plateforme",
+    "no_account": "Vous n'avez pas de compte ?",
+    "visit_platform": "Visitez notre plateforme",
+    "already_have_account": "Vous avez déjà un compte ?",
+    "create_account": "Créer un compte",
+    "continue_shopping": "Continuer vos achats",
+    "admin_login": "Connexion Admin",
+    "merchant_login": "Connexion Marchand",
+    "store_login": "Connexion Portail Magasin",
+    "customer_login": "Connexion Client",
+    "create_account_title": "Créer un compte",
+    "creating_account": "Création du compte...",
+    "sign_in_instead": "Se connecter",
+    "first_name": "Prénom",
+    "last_name": "Nom",
+    "phone_number": "Numéro de téléphone",
+    "marketing_consent": "Je souhaite recevoir des actualités et offres spéciales",
+    "password_requirements": "Doit contenir au moins 8 caractères, une lettre et un chiffre",
+    "check_email": "Vérifiez votre e-mail",
+    "reset_link_sent": "Nous avons envoyé un lien de réinitialisation à votre adresse e-mail. Veuillez vérifier votre boîte de réception et cliquer sur le lien.",
+    "didnt_receive_email": "Vous n'avez pas reçu l'e-mail ? Vérifiez votre dossier spam ou",
+    "try_again": "réessayez",
+    "remember_password": "Vous vous souvenez de votre mot de passe ?"
   },
   "nav": {
     "dashboard": "Tableau de bord",
@@ -191,5 +219,11 @@
     "time": "HH:mm",
     "datetime": "DD/MM/YYYY HH:mm",
     "currency": "{amount} {symbol}"
+  },
+  "onboarding": {
+    "banner": {
+      "title": "Premiers pas",
+      "dismiss": "Masquer"
+    }
   }
 }

static/locales/lb.json

@@ -111,7 +111,35 @@
     "invalid_credentials": "Ongëltege Benotzernumm oder Passwuert",
     "session_expired": "Är Sessioun ass ofgelaf. Mellt Iech w.e.g. erëm un.",
     "account_locked": "Äre Kont ass gespaart",
-    "account_inactive": "Äre Kont ass inaktiv"
+    "account_inactive": "Äre Kont ass inaktiv",
+    "signing_in": "Umellen...",
+    "sending": "Gëtt geschéckt...",
+    "send_reset_link": "Link fir zréckzesetzen schécken",
+    "reset_password_desc": "Gitt Är E-Mail-Adress an a mir schécken Iech e Link fir Äert Passwuert zréckzesetzen.",
+    "back_to_login": "Zréck zum Login",
+    "back_to_platform": "Zréck zur Plattform",
+    "no_account": "Kee Kont?",
+    "visit_platform": "Besicht eis Plattform",
+    "already_have_account": "Hutt Dir schonn e Kont?",
+    "create_account": "E Kont erstellen",
+    "continue_shopping": "Weider akafen",
+    "admin_login": "Admin Login",
+    "merchant_login": "Händler Login",
+    "store_login": "Buttek-Portal Login",
+    "customer_login": "Client Login",
+    "create_account_title": "Kont erstellen",
+    "creating_account": "Kont gëtt erstallt...",
+    "sign_in_instead": "Aloggen amplaz",
+    "first_name": "Virnumm",
+    "last_name": "Nonumm",
+    "phone_number": "Telefonsnummer",
+    "marketing_consent": "Ech wëll Neiegkeeten an Spezialangebotter kréien",
+    "password_requirements": "Muss mindestens 8 Zeechen, ee Buschtaf an eng Zuel enthalen",
+    "check_email": "Kuckt Är E-Mail",
+    "reset_link_sent": "Mir hunn e Link fir d'Passwuert zréckzesetzen op Är E-Mail-Adress geschéckt. Kuckt w.e.g. Ären Posteingang a klickt op de Link.",
+    "didnt_receive_email": "E-Mail net kritt? Kuckt Ären Spam-Dossier oder",
+    "try_again": "probéiert et nach eng Kéier",
+    "remember_password": "Passwuert erëm agefall?"
   },
   "nav": {
     "dashboard": "Dashboard",
@@ -191,5 +219,11 @@
     "time": "HH:mm",
     "datetime": "DD.MM.YYYY HH:mm",
     "currency": "{amount} {symbol}"
+  },
+  "onboarding": {
+    "banner": {
+      "title": "Ufänken",
+      "dismiss": "Verstoppen"
+    }
   }
 }