Feat v0.6.0 cluster registry (#36)

Co-authored-by: Jeffrey Smith <jasafpro@gmail.com>
Co-committed-by: Jeffrey Smith <jasafpro@gmail.com>

docker-compose-e2e.yml

@@ -1,12 +1,13 @@
 # docker-compose-e2e.yml — Multi-replica E2E testing (Postgres)
 #
-# Two Switchboard replicas behind an nginx load balancer,
+# Three Switchboard replicas behind an nginx load balancer,
 # sharing a single Postgres instance. Tests cross-replica
-# broadcast via pg_notify.
+# broadcast via pg_notify and cluster registry (v0.6.0).
 #
 # Usage:
 #   docker compose -f docker-compose-e2e.yml up --build -d
-#   ./ci/e2e-chat-test.sh
+#   ./ci/e2e-chat-test.sh    # chat E2E
+#   ./ci/e2e-cluster-test.sh # cluster registry E2E
 #   docker compose -f docker-compose-e2e.yml down -v
 
 services:
@@ -44,6 +45,10 @@ services:
       LOG_FORMAT: text
       LOG_LEVEL: info
       SEED_USERS: "alice:password123:user,bob:password456:user,charlie:password789:user"
+      CLUSTER_NODE_ID: "node-1"
+      CLUSTER_HEARTBEAT_INTERVAL: "5s"
+      CLUSTER_STALE_THRESHOLD: "15s"
+      CLUSTER_ENDPOINT: "http://switchboard-1:8080"
     depends_on:
       postgres:
         condition: service_healthy
@@ -70,12 +75,46 @@ services:
       LOG_FORMAT: text
       LOG_LEVEL: info
       SEED_USERS: "alice:password123:user,bob:password456:user,charlie:password789:user"
+      CLUSTER_NODE_ID: "node-2"
+      CLUSTER_HEARTBEAT_INTERVAL: "5s"
+      CLUSTER_STALE_THRESHOLD: "15s"
+      CLUSTER_ENDPOINT: "http://switchboard-2:8080"
     depends_on:
       postgres:
         condition: service_healthy
     ports:
       - "8082:80"
 
+  switchboard-3:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    environment:
+      PORT: "8080"
+      BASE_PATH: ""
+      DB_DRIVER: postgres
+      DATABASE_URL: postgres://switchboard:e2e-password@postgres:5432/switchboard_e2e?sslmode=disable
+      JWT_SECRET: e2e-jwt-secret
+      ENCRYPTION_KEY: e2e-encryption-key-32chars!!!!!
+      SWITCHBOARD_ADMIN_USERNAME: admin
+      SWITCHBOARD_ADMIN_PASSWORD: admin
+      STORAGE_BACKEND: pvc
+      STORAGE_PATH: /data/storage
+      CORS_ALLOWED_ORIGINS: "*"
+      EXT_ALLOW_PRIVATE_IPS: "true"
+      LOG_FORMAT: text
+      LOG_LEVEL: info
+      SEED_USERS: "alice:password123:user,bob:password456:user,charlie:password789:user"
+      CLUSTER_NODE_ID: "node-3"
+      CLUSTER_HEARTBEAT_INTERVAL: "5s"
+      CLUSTER_STALE_THRESHOLD: "15s"
+      CLUSTER_ENDPOINT: "http://switchboard-3:8080"
+    depends_on:
+      postgres:
+        condition: service_healthy
+    ports:
+      - "8083:80"
+
   lb:
     image: nginx:alpine
     volumes:
@@ -85,3 +124,4 @@ services:
     depends_on:
       - switchboard-1
       - switchboard-2
+      - switchboard-3