fix(cycle): gate the cycle ring tile and page redirect on the operator-aware module flag

The insights cycle ring tile and the /cycle page redirect gated on
user.cycleTrackingEnabled, which /api/auth/me resolves without the
operator availability layer — so with the Cycle module disabled
server-wide the ring still rendered (and fired its calendar read) and a
direct /cycle URL still loaded.

Read user.modules.cycle instead, which the /me map already AND-s with the
operator switch, so an operator-off instance suppresses both surfaces.

src/app/cycle/page.tsx

@@ -10,18 +10,21 @@ import { CycleView } from "@/components/cycle/cycle-view";
 /**
  * v1.15.0 — the cycle vertical entry.
  *
- * Gated on `cycleTrackingEnabled` from `GET /api/auth/me` (resolved
- * server-side from gender + the per-user opt-in). An unauthenticated visitor
- * is bounced to login; an authenticated account without the feature enabled
- * is bounced home (the nav entry is already hidden for them, so this only
- * catches a direct URL hit). Every `/api/cycle/*` route also enforces the
- * gate server-side, so this is a UX redirect, not the security boundary.
+ * Gated on the resolved `modules.cycle` flag from `GET /api/auth/me`
+ * (v1.18.0 — the per-user toggle AND the operator server-wide kill-switch;
+ * the operator-unaware `cycleTrackingEnabled` field is NOT used here so an
+ * operator-disabled instance bounces a direct URL hit too). An
+ * unauthenticated visitor is bounced to login; an authenticated account
+ * without the module enabled is bounced home (the nav entry is already
+ * hidden for them, so this only catches a direct URL hit). Every
+ * `/api/cycle/*` route also enforces the gate server-side, so this is a UX
+ * redirect, not the security boundary.
  */
 export default function CyclePage() {
   const { user, isLoading, isAuthenticated } = useAuth();
   const router = useRouter();
 
-  const enabled = user?.cycleTrackingEnabled === true;
+  const enabled = user?.modules?.cycle !== false;
 
   useEffect(() => {
     if (isLoading) return;

src/app/insights/page.tsx

@@ -404,11 +404,16 @@ export default function InsightsPage() {
         // v1.15.3 — the cycle ring rides the scores strip as a gated sibling
         // tile, only for a cycle-tracking account, so its calendar read never
         // fires otherwise (the same `/api/auth/me` gate the sidebar nav uses).
-        extraTile={user?.cycleTrackingEnabled ? <CycleRingTile /> : undefined}
+        // v1.18.0 — gate on the resolved `modules.cycle` flag (per-user toggle
+        // AND the operator server-wide kill-switch) so an operator-off
+        // instance never renders the ring nor fires its calendar read.
+        extraTile={
+          user?.modules?.cycle === true ? <CycleRingTile /> : undefined
+        }
         // v1.15.5 — when the cycle ring is shown it TAKES the Strain slot:
         // hide Strain so the strip stays compact instead of growing a sixth
         // tile. Strain stays visible for non-cycle accounts.
-        hideStrain={user?.cycleTrackingEnabled === true}
+        hideStrain={user?.modules?.cycle === true}
       />
     ),
     "daily-briefing": flags.briefing ? (