Fix PostgreSQL replication: add pg_hba.conf entries for replicator user

- Create init-master.sh that runs SQL and appends replication rules to pg_hba.conf
- Switch docker-compose-prod template from init-master.sql to init-master.sh
- Fixes "no pg_hba.conf entry for replication connection" error

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

docker/pgsql/init-master.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+set -e
+
+psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL
+    CREATE USER replicator WITH REPLICATION ENCRYPTED PASSWORD 'e-ticket';
+    SELECT pg_create_physical_replication_slot('slave_slot');
+EOSQL
+
+echo "host replication replicator 0.0.0.0/0 md5" >> "$PGDATA/pg_hba.conf"
+echo "host all all 0.0.0.0/0 md5" >> "$PGDATA/pg_hba.conf"
+
+pg_ctl reload -D "$PGDATA"