Add 'Set Recap License' StartOS action + s/Keysat license/Recap license/

Two related changes:

1. New StartOS action: 'Set Recap License'

   Symmetric with the existing 'Set Gemini API Key' action — paste a
   LIC1-... key into the StartOS Actions menu and it gets persisted.
   Added because some users prefer the StartOS form for credentials
   over the in-app activation modal.

   Implementation:
     • startos/file-models/config.json.ts: schema gains recap_license_key
     • startos/actions/setLicense.ts: input form (masked, regex-checks
       for the LIC1- prefix), persists via configFile.merge()
     • startos/actions/index.ts: registers the new action
     • server/license.js: readLicenseString() falls back to
       startos-config.json after the legacy license.txt path. Resolution
       order: env → license.txt → startos-config.json
     • server/license-middleware.js: faster license-file poll (30 s,
       env-overridable RECAP_LICENSE_FILE_POLL_MS) re-runs checkLicense
       so action-set keys take effect within seconds, not the 6 h online
       cycle. If the new key parses as 'licensed', kicks an immediate
       online check to confirm.

2. Copy fix: 'Keysat license' → 'Recap license' in user-facing text

   Keysat is the licensing system underneath, but customers buy a
   'Recap license'. Updated:
     • Activation screen subtitle (public/index.html)
     • 402 message in the activation gate (server/license-middleware.js)

   Internal references (PRODUCT_SLUG, KEYSAT_BASE_URL, the issuer.pub
   filename, the 'Issuer: licensing.keysat.xyz' display in the
   activation card) stay as Keysat — those are accurate.

Smoke tested locally: starting the server with no license, then
writing a fake LIC1-... key into startos-config.json, the
license-file poll picks it up within ~2 s and transitions state from
'unlicensed' to 'invalid' (since the fake key fails Ed25519
verification, as expected). With a real key, the same path would land
in 'licensed'.

server/license-middleware.js

@@ -30,6 +30,12 @@ const VALIDATE_INTERVAL_MS = parseInt(
   10
 );
 const ACTIVATE_VALIDATE_TIMEOUT_MS = 8000;
+// How often to re-read the license file (fast path for keys set via the
+// StartOS action — the 6 h online cycle is too slow for that UX).
+const LICENSE_FILE_POLL_MS = parseInt(
+  process.env.RECAP_LICENSE_FILE_POLL_MS || "30000",
+  10
+);
 
 // ── Online refresh ──────────────────────────────────────────────────────────
 // Calls the licensing server (with the network-error grace logic in
@@ -59,6 +65,28 @@ export function startLicenseRefresh() {
   setInterval(() => {
     refreshLicenseOnline("scheduled").catch(() => {});
   }, VALIDATE_INTERVAL_MS);
+  // Faster offline-only re-read so a license set via the "Set Recap
+  // License" StartOS action (or a manual edit to license.txt) is picked
+  // up within seconds instead of 6 h. Calls checkLicense() rather than
+  // validateOnline() to avoid hammering Keysat — the next scheduled
+  // validateOnline tick will confirm with the server. If a fresh key
+  // appears, kick an immediate online check too so an unrevoked Pro
+  // license doesn't get stuck pending until the 6 h tick.
+  setInterval(() => {
+    const prev = LIC;
+    const next = license.checkLicense();
+    if (next.licenseId !== prev.licenseId || next.state !== prev.state) {
+      LIC = next;
+      console.log(
+        `[license] file refresh: state=${LIC.state}` +
+          (LIC.reason ? ` reason=${LIC.reason}` : "") +
+          ` entitlements=[${[...LIC.entitlements].join(",")}]`
+      );
+      if (next.state === "licensed") {
+        refreshLicenseOnline("file change").catch(() => {});
+      }
+    }
+  }, LICENSE_FILE_POLL_MS);
 }
 
 // ── Free-tier slot management ───────────────────────────────────────────────
@@ -139,7 +167,7 @@ export function setupLicenseMiddleware(app) {
       message:
         LIC.state === "licensed"
           ? "Your license is missing the 'core' entitlement. Contact the seller."
-          : "This feature requires a Keysat license. Upgrade to unlock.",
+          : "This feature requires a Recap license. Upgrade to unlock.",
       state: LIC.state,
       reason: LIC.reason,
       activate_url: "/#activate",