fix: improve form default values and remove unnecessary placeholder

- Set sensible defaults for upstream node: port=80, weight=1
- Remove placeholder from Service ID field

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: calycekr

src/components/form-slice/FormPartRoute/index.tsx

@@ -181,7 +181,6 @@ export const FormSectionService = () => {
         control={control}
         name="service_id"
         label={t('form.upstreams.serviceId')}
-        placeholder="00000000000000000001"
       />
     </FormSection>
   );

src/types/schema/apisix/upstreams.ts

@@ -58,8 +58,8 @@ const UpstreamPassHost = z.union([
 
 const UpstreamNode = z.object({
   host: z.string().min(1),
-  port: z.number().int().gte(1).lte(65535),
-  weight: z.number().int(),
+  port: z.number().int().gte(1).lte(65535).default(80),
+  weight: z.number().int().default(1),
   priority: z.number().int().optional(),
 });