fix: type conversion (#9)

src/components/server.tsx

@@ -43,7 +43,7 @@ const serverFormSchema = z.object({
     name: z.string().min(1),
     note: asOptionalField(z.string()),
     public_note: asOptionalField(z.string()),
-    display_index: z.number().int(),
+    display_index: z.coerce.number().int(),
     hide_for_guest: asOptionalField(z.boolean()),
     enable_ddns: asOptionalField(z.boolean()),
     ddns_profiles: asOptionalField(z.array(z.number())),