feat: add ntfy notification action foundation

.env.example

@@ -13,6 +13,12 @@ PORT=3000
 CORS_ORIGINS=http://localhost:4174
 LOG_LEVEL=warn
 
+# Public base URL used for notification action links.
+# Required for intake reminder action buttons/links.
+# PUBLIC_APP_URL=https://medassist.example.com
+# For mobile testing on the same LAN, use your laptop IP instead of localhost,
+# e.g. PUBLIC_APP_URL=http://192.168.0.113:5173 and add that origin to CORS_ORIGINS.
+
 # Levels: debug, info, warn, error, silent
 # Controls: backend Fastify logging, frontend nginx access logs (Docker),
 #           and frontend browser console (via build-time injection)
@@ -149,6 +155,6 @@ EXPIRY_WARNING_DAYS=30            # Days before expiry to show yellow warning
 # UI defaults
 # DEFAULT_LANGUAGE=en              # en or de
 # DEFAULT_STOCK_CALCULATION_MODE=automatic  # automatic or manual
-# DEFAULT_SHARE_STOCK_STATUS=true  # Show stock status on shared schedule links
+# DEFAULT_SHARE_MEDICATION_OVERVIEW=false  # Show medication overview section on shared schedule links
 # DEFAULT_UPCOMING_TODAY_ONLY=false
 # DEFAULT_SHARE_SCHEDULE_TODAY_ONLY=false