fix: Docker Compose database initialization

- init-databases.sh: create cameleer3 DB for cameleer3-server, connect
  to $POSTGRES_DB explicitly (avoids 'database cameleer does not exist')
- clickhouse-init.sql: auto-create cameleer database on first start
- docker-compose.yml: fix cameleer3-server datasource to cameleer3 DB,
  add ClickHouse init script volume mount, pass credentials

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

docker-compose.yml

@@ -94,7 +94,9 @@ services:
       clickhouse:
         condition: service_started
     environment:
-      SPRING_DATASOURCE_URL: jdbc:postgresql://postgres:5432/${POSTGRES_DB:-cameleer_saas}
+      SPRING_DATASOURCE_URL: jdbc:postgresql://postgres:5432/cameleer3
+      SPRING_DATASOURCE_USERNAME: ${POSTGRES_USER:-cameleer}
+      SPRING_DATASOURCE_PASSWORD: ${POSTGRES_PASSWORD:-cameleer_dev}
       CLICKHOUSE_URL: jdbc:clickhouse://clickhouse:8123/cameleer
       CAMELEER_AUTH_TOKEN: ${CAMELEER_AUTH_TOKEN:-default-bootstrap-token}
       CAMELEER_TENANT_ID: ${CAMELEER_TENANT_SLUG:-default}
@@ -117,6 +119,7 @@ services:
     restart: unless-stopped
     volumes:
       - chdata:/var/lib/clickhouse
+      - ./docker/clickhouse-init.sql:/docker-entrypoint-initdb.d/init.sql:ro
     healthcheck:
       test: ["CMD-SHELL", "clickhouse-client --query 'SELECT 1'"]
       interval: 10s

docker/clickhouse-init.sql

@@ -0,0 +1 @@
+CREATE DATABASE IF NOT EXISTS cameleer;

docker/init-databases.sh

@@ -1,7 +1,9 @@
 #!/bin/bash
 set -e
 
-psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" <<-EOSQL
+psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL
     CREATE DATABASE logto;
+    CREATE DATABASE cameleer3;
     GRANT ALL PRIVILEGES ON DATABASE logto TO $POSTGRES_USER;
+    GRANT ALL PRIVILEGES ON DATABASE cameleer3 TO $POSTGRES_USER;
 EOSQL