fix: repoint control plane probes to api.moleculesai.app (Railway)

The CP migrated from Fly.io to Railway in the Apr 2026 infra
migration, but the status page kept probing molecule-cp.fly.dev.
That host is retired and connection-refuses every probe, so the
page showed the CP + legal pages as 29.94% uptime with 2+ days of
solid red in the history view — pure false alarm.

Changes:
  - Control plane API: /health now probed at api.moleculesai.app
  - Control plane — Legal pages: /legal/terms same host

Upptime regenerates history/*.yml + README on the next summary run,
so no manual touch-up needed for those artifacts. The "down" rows
visible today will age out of the 24h / 7d windows over the coming
week as fresh "up" samples accumulate.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.upptimerc.yml

@@ -23,12 +23,16 @@ sites:
     # Developer documentation at doc.moleculesai.app (Fumadocs/Next.js, deployed via Vercel)
 
   - name: Control plane API
-    url: https://molecule-cp.fly.dev/health
-    # /health returns {"service":"molecule-cp","status":"ok"}
+    url: https://api.moleculesai.app/health
+    # /health returns {"service":"molecule-cp","status":"ok"}.
+    # Repointed from molecule-cp.fly.dev → api.moleculesai.app (Railway)
+    # after the Apr 2026 infra migration; the old fly.dev host is
+    # retired and was showing the CP as "down" on every check.
 
   - name: Control plane — Legal pages
-    url: https://molecule-cp.fly.dev/legal/terms
-    # HTML page; tests markdown-renderer path + static embed still works
+    url: https://api.moleculesai.app/legal/terms
+    # HTML page; tests markdown-renderer path + static embed still works.
+    # Repointed off fly.dev (see note above).
 
   - name: Landing page
     url: https://www.moleculesai.app/