fix: remove remaining false SDK claims from features, docs/premium, docs/api (M-2)

- features.tsx: 'JavaScript SDK & REST API' → 'REST API (260+ endpoints)'
- docs/premium: 'the JS SDK' → 'the REST API'
- docs/api: 'and the SDK' → 'and integrations'

The SDK package doesn't exist; the REST API is the correct integration surface.
Deployed to live dashcaddy.net via cPanel API with cache-busting rewrite.

src/app/docs/premium/page.tsx

@@ -14,7 +14,7 @@ export default function DocsPremiumPage() {
           DashCaddy's philosophy is that the day-to-day platform should be free forever. Everything you need to run
           a single host — the dashboard, the full template catalog, Caddy + DNS + TLS automation, real-time monitoring,
           Prometheus metrics, multi-user accounts with 2FA and RBAC, the Security Center, the AI Intent Router, the MCP
-          Server, the JS SDK, and backup/restore — works without a license. Premium adds four capabilities aimed at
+          Server, the REST API, and backup/restore — works without a license. Premium adds four capabilities aimed at
           teams and multi-host operators who need single sign-on, multi-container stacks, cluster orchestration, or
           fleet-wide management.
         </p>