fix: wire unit Select to react-hook-form via setValue

app/(dashboard)/dashboard/services/new/page.tsx

@@ -34,6 +34,7 @@ export default function NewServicePage() {
   const {
     register,
     handleSubmit,
+    setValue,
     formState: { errors, isSubmitting },
   } = useForm({
     resolver: standardSchemaResolver(serviceSchema),
@@ -103,7 +104,7 @@ export default function NewServicePage() {
               </div>
               <div className="space-y-2">
                 <Label htmlFor="unit">单位</Label>
-                <Select>
+                <Select onValueChange={(value) => setValue("unit", value)}>
                   <SelectTrigger>
                     <SelectValue placeholder="选择单位" />
                   </SelectTrigger>
@@ -115,6 +116,7 @@ export default function NewServicePage() {
                     <SelectItem value="段">段</SelectItem>
                   </SelectContent>
                 </Select>
+                {errors.unit && <p className="text-xs text-destructive">{errors.unit.message}</p>}
               </div>
             </div>