refactor(docker): rename network "shared" to "goclaw-net" (#405)

The generic name "shared" conflicts with other projects on the same
host. Use a project-scoped name to avoid collisions.

Makefile

@@ -37,7 +37,7 @@ COMPOSE = $(COMPOSE_BASE) $(COMPOSE_EXTRA)
 UPGRADE = docker compose -f docker-compose.yml -f docker-compose.postgres.yml -f docker-compose.upgrade.yml
 
 net:
-	docker network inspect shared >/dev/null 2>&1 || docker network create shared
+	docker network inspect goclaw-net >/dev/null 2>&1 || docker network create goclaw-net
 
 version-file:
 	@echo $(VERSION) > VERSION

docker-compose.selfservice.yml

@@ -15,7 +15,7 @@ services:
       - "${GOCLAW_UI_PORT:-3000}:80"
     networks:
       - default
-      - shared
+      - goclaw-net
     depends_on:
       - goclaw
     restart: unless-stopped

docker-compose.yml

@@ -60,7 +60,7 @@ services:
           pids: 200
     networks:
       - default
-      - shared
+      - goclaw-net
     restart: unless-stopped
 
 volumes:
@@ -68,6 +68,6 @@ volumes:
   goclaw-workspace:
 
 networks:
-  shared:
-    name: shared
+  goclaw-net:
+    name: goclaw-net
     driver: bridge