feat: full tenant cleanup on delete — Docker resources, PG schema, CH data (#55)

DockerTenantProvisioner.remove() now cleans up all tenant Docker resources:
containers (by cameleer.tenant label), env networks, tenant network, JAR volume.
TenantDataCleanupService drops the tenant's PostgreSQL schema and deletes all
ClickHouse data for GDPR compliance.

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

src/main/resources/application.yml

@@ -49,6 +49,7 @@ cameleer:
     public-host: ${PUBLIC_HOST:localhost}
     public-protocol: ${PUBLIC_PROTOCOL:https}
     datasource-url: ${CAMELEER_SERVER_DB_URL:jdbc:postgresql://postgres:5432/cameleer3}
+    clickhouse-url: ${CLICKHOUSE_URL:jdbc:clickhouse://clickhouse:8123/cameleer}
     oidc-issuer-uri: ${PUBLIC_PROTOCOL:https}://${PUBLIC_HOST:localhost}/oidc
     oidc-jwk-set-uri: http://logto:3001/oidc/jwks
     cors-origins: ${PUBLIC_PROTOCOL:https}://${PUBLIC_HOST:localhost}