feat: add notification microservices and transactional outbox

.env.example

@@ -81,6 +81,43 @@ QUEUE_DEFAULT_BACKOFF_MS=1000
 QUEUE_REMOVE_ON_COMPLETE=true
 QUEUE_WORKER_CONCURRENCY=5
 
+# Phase 1 microservice routing (false keeps the current in-process path)
+NOTIFICATION_SERVICE_ENABLED=false
+# The polling dispatcher is independently disabled for the current production monolith.
+OUTBOX_DISPATCHER_ENABLED=false
+OUTBOX_POLL_INTERVAL_MS=1000
+OUTBOX_BATCH_SIZE=25
+OUTBOX_MAX_ATTEMPTS=8
+OUTBOX_LEASE_TIMEOUT_MS=60000
+OUTBOX_RETRY_BASE_MS=1000
+OUTBOX_RETRY_MAX_MS=60000
+# Local development only. Production must inject non-guest credentials and TLS/amqps.
+RABBITMQ_URL=amqp://guest:guest@127.0.0.1:5672
+RABBITMQ_HOST=127.0.0.1
+RABBITMQ_PORT=5672
+RABBITMQ_USERNAME=
+RABBITMQ_PASSWORD=
+RABBITMQ_VHOST=/
+RABBITMQ_TLS_ENABLED=false
+RABBITMQ_TLS_REQUIRED=true
+RABBITMQ_CA_CERT_BASE64=
+RABBITMQ_CA_CERT_PATH=
+RABBITMQ_CLIENT_CERT_BASE64=
+RABBITMQ_CLIENT_CERT_PATH=
+RABBITMQ_CLIENT_KEY_BASE64=
+RABBITMQ_CLIENT_KEY_PATH=
+RABBITMQ_TLS_REJECT_UNAUTHORIZED=true
+RABBITMQ_SERVERNAME=
+RABBITMQ_HEARTBEAT_SECONDS=10
+RABBITMQ_RECONNECT_SECONDS=5
+RABBITMQ_CONNECTION_TIMEOUT_MS=10000
+NOTIFICATION_RPC_TIMEOUT_MS=3000
+NOTIFICATION_RPC_RETRIES=1
+NOTIFICATION_CIRCUIT_FAILURE_THRESHOLD=3
+NOTIFICATION_CIRCUIT_RESET_MS=15000
+NOTIFICATION_SERVICE_PORT=4001
+NOTIFICATION_RMQ_PREFETCH=10
+
 STORAGE_PROVIDER=local
 MEDIA_ACCESS_MODE=direct
 STORAGE_BASE_PATH=uploads