chore(release): 2.1.3

- Bump package, lockfile, iOS DailyNotificationPlugin.podspec, and synced
  version strings (definitions header, FetchWorker mock payload).
- Add CHANGELOG [2.1.3] for Android optional contentFetch fields and README.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@timesafari/daily-notification-plugin",
-  "version": "2.1.2",
+  "version": "2.1.3",
   "description": "TimeSafari Daily Notification Plugin - Enterprise-grade daily notification functionality with dual scheduling, callback support, TTL-at-fire logic, and comprehensive observability across Mobile (Capacitor) and Desktop (Electron) platforms",
   "main": "dist/plugin.js",
   "module": "dist/esm/index.js",