feat: backend improvements - reminder tracking, share stock status, planner notifications (#145)

- Separate stock/intake reminder tracking in DB with dedicated columns
- Add shareStockStatus setting to control stock visibility on shared links
- Rewrite planner notification to support both email and Shoutrrr push
- Add push notification footer text for intake and stock reminders
- New DB migrations: stock_reminder_tracking (0006), share_stock_status (0007)
- Update backend i18n with demandCalculator section and critically low text
- Add 514 passing backend tests including new coverage for all changes

backend/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "medassist-ng-backend",
-  "version": "1.8.8",
+  "version": "1.9.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "medassist-ng-backend",
-      "version": "1.8.8",
+      "version": "1.9.0",
       "dependencies": {
         "@fastify/cookie": "^10.0.1",
         "@fastify/cors": "^10.0.1",