Booking flow: required terms and privacy checkbox with i18n

Also includes admin, dashboard, and API updates; PWA icon assets; and
assorted layout and utility changes on dev.

frontend/src/i18n/locales/en.json

@@ -117,7 +117,11 @@
       "rucOptional": "Optional - for invoice",
       "reserveSpot": "Reserve My Spot",
       "proceedPayment": "Proceed to Payment",
-      "termsNote": "By booking, you agree to our terms and conditions.",
+      "termsAgreePart1": "I agree to the ",
+      "termsOfService": "Terms of Service",
+      "termsAgreePart2": " and ",
+      "privacyPolicy": "Privacy Policy",
+      "termsAgreePart3": ".",
       "soldOutMessage": "This event is fully booked. Check back later or browse other events.",
       "errors": {
         "nameRequired": "Please enter your full name",
@@ -129,7 +133,8 @@
         "phoneRequired": "Phone number is required",
         "bookingFailed": "Booking failed. Please try again.",
         "rucInvalidFormat": "Invalid format. Example: 12345678-9",
-        "rucInvalidCheckDigit": "Invalid RUC. Please verify the number."
+        "rucInvalidCheckDigit": "Invalid RUC. Please verify the number.",
+        "termsRequired": "You must agree to the Terms of Service and Privacy Policy to continue."
       }
     },
     "summary": {

frontend/src/i18n/locales/es.json

@@ -117,7 +117,11 @@
       "rucOptional": "Opcional - para facturación",
       "reserveSpot": "Reservar Mi Lugar",
       "proceedPayment": "Proceder al Pago",
-      "termsNote": "Al reservar, aceptas nuestros términos y condiciones.",
+      "termsAgreePart1": "Acepto los ",
+      "termsOfService": "Términos de Servicio",
+      "termsAgreePart2": " y la ",
+      "privacyPolicy": "Política de Privacidad",
+      "termsAgreePart3": ".",
       "soldOutMessage": "Este evento está lleno. Vuelve más tarde o explora otros eventos.",
       "errors": {
         "nameRequired": "Por favor ingresa tu nombre completo",
@@ -129,7 +133,8 @@
         "phoneRequired": "El número de teléfono es requerido",
         "bookingFailed": "La reserva falló. Por favor intenta de nuevo.",
         "rucInvalidFormat": "Formato inválido. Ej: 12345678-9",
-        "rucInvalidCheckDigit": "RUC inválido. Verifique el número."
+        "rucInvalidCheckDigit": "RUC inválido. Verifique el número.",
+        "termsRequired": "Debes aceptar los Términos de Servicio y la Política de Privacidad para continuar."
       }
     },
     "summary": {