feat(server): deliver push without a Firebase project

Every notification depended on Firebase Cloud Messaging, so a missing
Firebase project, which is the current state, meant no notification could be
delivered on any platform. Web Push and token-based Apple Push are now first
class transports alongside FCM, chosen per registered device, and a scheduled
Cloudflare Worker drain retries an outbox so a provider outage delays rather
than drops a message.

server/cloudflare-worker/wrangler.toml

@@ -5,6 +5,14 @@ compatibility_date = "2024-04-01"
 [vars]
 BACKEND_ORIGIN = "http://192.168.0.39:5050"
 SERVICE_NAME = "D3RO Voice Cloud Gateway"
+# Supabase project base URL for the scheduled push-outbox drain.
+# SUPABASE_URL = "https://<project-ref>.supabase.co"
+# PUSH_DRAIN_BATCH_LIMIT = "20"
+
+# Scheduled drain of the Supabase push outbox (every minute).
+# Requires the secret: wrangler secret put SUPABASE_SERVICE_ROLE_KEY
+[triggers]
+crons = ["* * * * *"]
 
 # Cloudflare Custom Domain / Route Binding (선택 시 활성화)
 # routes = [