feat: NPM remote mode for cross-machine deployments

- Add npm_remote setting: when enabled, proxy forwards to server_ip with
  published host ports instead of Docker container names
- Deployer looks up assigned host port via InspectContainerPort in remote mode
- Auto-remove stale containers with same name before creating new ones
- Add Remote NPM toggle with warning on NPM settings page
- DB migration + schema for npm_remote column

internal/store/store.go

@@ -111,6 +111,8 @@ func (s *Store) runMigrations() error {
 		`ALTER TABLE settings ADD COLUMN traefik_api_url TEXT NOT NULL DEFAULT ''`,
 		// Set default network for existing databases with empty network.
 		`UPDATE settings SET network = 'docker-watcher' WHERE network = ''`,
+		// NPM remote mode: forward to server_ip instead of container name.
+		`ALTER TABLE settings ADD COLUMN npm_remote INTEGER NOT NULL DEFAULT 0`,
 	}
 
 	for _, m := range migrations {
@@ -210,6 +212,7 @@ CREATE TABLE IF NOT EXISTS settings (
 	polling_interval    TEXT NOT NULL DEFAULT '5m',
 	base_volume_path   TEXT NOT NULL DEFAULT '',
 	ssl_certificate_id     INTEGER NOT NULL DEFAULT 0,
+	npm_remote             INTEGER NOT NULL DEFAULT 0,
 	traefik_entrypoint     TEXT NOT NULL DEFAULT 'websecure',
 	traefik_cert_resolver  TEXT NOT NULL DEFAULT 'letsencrypt',
 	traefik_network        TEXT NOT NULL DEFAULT '',