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/cassandra/.env.example

@@ -0,0 +1,22 @@
+# Cassandra version
+CASSANDRA_VERSION=5.0.2
+
+# Timezone
+TZ=UTC
+
+# Cluster configuration
+CASSANDRA_CLUSTER_NAME=Test Cluster
+CASSANDRA_DC=datacenter1
+CASSANDRA_RACK=rack1
+CASSANDRA_ENDPOINT_SNITCH=GossipingPropertyFileSnitch
+CASSANDRA_NUM_TOKENS=256
+CASSANDRA_SEEDS=cassandra
+CASSANDRA_START_RPC=false
+
+# JVM heap sizes
+MAX_HEAP_SIZE=1G
+HEAP_NEWSIZE=100M
+
+# Port overrides (optional)
+# CASSANDRA_CQL_PORT_OVERRIDE=9042
+# CASSANDRA_THRIFT_PORT_OVERRIDE=9160