Add environment configuration and documentation for various services

- Created .env.example files for Kafka, Kibana, KodBox, Kong, Langfuse, Logstash, n8n, Nginx, OceanBase, OpenCoze, RocketMQ, TiDB, and TiKV.
- Added README.md and README.zh.md files for OceanBase, RocketMQ, TiDB, and TiKV, detailing usage, configuration, and access instructions.
- Implemented docker-compose.yaml files for OceanBase, RocketMQ, TiDB, and TiKV, defining service configurations, health checks, and resource limits.
- Included broker.conf for RocketMQ to specify broker settings.
- Established a consistent timezone (UTC) across all services.
- Provided optional port overrides in .env.example files for flexibility in deployment.

src/elasticsearch/.env.example

@@ -0,0 +1,20 @@
+# Elasticsearch version
+ELASTICSEARCH_VERSION=8.16.1
+
+# Timezone
+TZ=UTC
+
+# Cluster configuration
+ELASTICSEARCH_CLUSTER_NAME=docker-cluster
+ELASTICSEARCH_DISCOVERY_TYPE=single-node
+
+# Security settings
+ELASTICSEARCH_SECURITY_ENABLED=false
+ELASTICSEARCH_SSL_ENABLED=false
+
+# JVM heap size
+ELASTICSEARCH_HEAP_SIZE=1g
+
+# Port overrides (optional)
+# ELASTICSEARCH_HTTP_PORT_OVERRIDE=9200
+# ELASTICSEARCH_TRANSPORT_PORT_OVERRIDE=9300