fix: remove :ro from clickhouse-users.xml mount

ClickHouse entrypoint needs write access to resolve from_env attribute
and apply CLICKHOUSE_PASSWORD to the default user config.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -201,7 +201,7 @@ services:
     volumes:
       - chdata:/var/lib/clickhouse
       - ./docker/clickhouse-init.sql:/docker-entrypoint-initdb.d/init.sql:ro
-      - ./docker/clickhouse-users.xml:/etc/clickhouse-server/users.d/default-user.xml:ro
+      - ./docker/clickhouse-users.xml:/etc/clickhouse-server/users.d/default-user.xml
     healthcheck:
       test: ["CMD-SHELL", "clickhouse-client --password ${CLICKHOUSE_PASSWORD:-cameleer_ch} --query 'SELECT 1'"]
       interval: 10s