improvement: multi organization possibility implemented for users (owners and staffs)

frontend/src/app/(public)/register/page.tsx

@@ -18,6 +18,7 @@ const registerSchema = z.object({
         .regex(/[0-9]/, 'Password must contain at least one number'),
     confirmPassword: z.string(),
     organizationName: z.string().min(2, 'Organization name must be at least 2 characters'),
+    organizationEmail: z.string().email('Please enter a valid organization email'),
     organizationType: z.enum(['CLINIC', 'LAB'], {
         message: 'Please select organization type',
     }),
@@ -47,7 +48,7 @@ export default function RegisterPage() {
     const handleNext = async () => {
         const fieldsToValidate = step === 1
             ? ['name', 'email', 'password', 'confirmPassword']
-            : ['organizationName', 'organizationType'];
+            : ['organizationName', 'organizationEmail', 'organizationType'];
 
         const isValid = await trigger(fieldsToValidate as any);
         if (isValid) {
@@ -62,6 +63,7 @@ export default function RegisterPage() {
                 data.password,
                 data.name,
                 data.organizationName,
+                data.organizationEmail,
                 data.organizationType
             );
             // No need to redirect - auth context will handle it
@@ -182,6 +184,14 @@ export default function RegisterPage() {
                                     error={errors.organizationName?.message}
                                     icon={<Building2 className="h-5 w-5 icon-flat" />}
                                 />
+                                <Input
+                                    label="Organization email"
+                                    {...register('organizationEmail')}
+                                    type="email"
+                                    placeholder="contact@sunshineclinic.com"
+                                    error={errors.organizationEmail?.message}
+                                    icon={<Mail className="h-5 w-5 icon-flat" />}
+                                />
                                 <div>
                                     <label className="block text-sm font-medium text-text-secondary mb-2">
                                         Organization type