ui: add Cursor adapter option and mark non-functional adapters as Coming Soon

Only Claude Code and Codex are selectable. OpenClaw, Cursor, Shell Command,
and HTTP Webhook are shown as disabled with "Coming soon" across all adapter
selection UIs: onboarding wizard, agent config form, and invite landing page.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ui/src/components/agent-config-primitives.tsx

@@ -53,6 +53,7 @@ export const adapterLabels: Record<string, string> = {
   claude_local: "Claude (local)",
   codex_local: "Codex (local)",
   openclaw: "OpenClaw",
+  cursor: "Cursor",
   process: "Process",
   http: "HTTP",
 };