Add multi-tenant cloud mode: self-serve purchase, credit metering, core-decoupling

Introduces RECAP_MODE=multi alongside single-mode self-host:
- Tenant auth + accounts (magic-link via System SMTP), per-tenant credit pool,
  anonymous trial minting with per-IP/-64 caps
- Self-serve Pro/Max purchase: inline Lightning (BTCPay) + card (Zaprite),
  prepaid 30-day periods, expiry-reminder emails
- Core-decoupling: relay owns cloud tier/expiry keyed by Recaps user-id
- SQLite (better-sqlite3) schema for multi-mode; filesystem unchanged for single
- StartOS actions/versions through 0.2.155

startos/actions/setLicense.ts

@@ -5,9 +5,9 @@ const { InputSpec, Value } = sdk
 
 const inputSpec = InputSpec.of({
   recap_license_key: Value.text({
-    name: 'Recap License Key',
+    name: 'Recaps License Key',
     description:
-      'Paste your Recap license key here. Keys start with "LIC1-..." — get one from your Recap seller. (Keys are also accepted via the web UI activation screen.)',
+      'Paste your Recaps license key here. Keys start with "LIC1-..." — get one from your Recaps seller. (Keys are also accepted via the web UI activation screen.)',
     required: true,
     default: null,
     masked: true,
@@ -26,9 +26,9 @@ export const setLicense = sdk.Action.withInput(
   'set-license',
 
   async ({ effects }) => ({
-    name: 'Set Recap License',
+    name: 'Set Recaps License',
     description:
-      'Activate a Recap license to unlock paid features (channel & podcast subscriptions, auto-queue, and a monthly allotment of relay credits).',
+      'Activate a Recaps license to unlock paid features (channel & podcast subscriptions, auto-queue, and a monthly allotment of relay credits).',
     warning: null,
     allowedStatuses: 'any',
     group: 'Setup',