fix: make subscription panel reactive to actual tier (#7354)

## Summary

Was previously hard-coded, now is actually reactive to value returned
from server

## Details 

- Update CloudSubscriptionStatusResponse to use generated types from
comfyRegistryTypes which includes subscription_tier
- Add subscriptionTier computed to useSubscription composable
- Make SubscriptionPanel tierName, tierPrice, and tierBenefits reactive
to actual subscription tier from API
- Normalize i18n tier structure with consistent value/label format
- Add FOUNDERS_EDITION tier support

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7354-fix-make-subscription-panel-reactive-to-actual-tier-2c66d73d365081059a7be875c13fdd0c)
by [Unito](https://www.unito.io)

---------

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

tests-ui/tests/platform/cloud/subscription/useSubscription.test.ts

@@ -152,10 +152,28 @@ describe('useSubscription', () => {
       expect(formattedRenewalDate.value).toBe('')
     })
 
-    it('should format monthly price correctly', () => {
-      const { formattedMonthlyPrice } = useSubscription()
+    it('should return subscription tier from status', async () => {
+      vi.mocked(global.fetch).mockResolvedValue({
+        ok: true,
+        json: async () => ({
+          is_active: true,
+          subscription_id: 'sub_123',
+          subscription_tier: 'CREATOR',
+          renewal_date: '2025-11-16T12:00:00Z'
+        })
+      } as Response)
 
-      expect(formattedMonthlyPrice.value).toBe('$20')
+      mockIsLoggedIn.value = true
+      const { subscriptionTier, fetchStatus } = useSubscription()
+
+      await fetchStatus()
+      expect(subscriptionTier.value).toBe('CREATOR')
+    })
+
+    it('should return null when subscription tier is not available', () => {
+      const { subscriptionTier } = useSubscription()
+
+      expect(subscriptionTier.value).toBeNull()
     })
   })