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/nginx/.env.example

@@ -0,0 +1,13 @@
+# Nginx version
+NGINX_VERSION=1.29.2-alpine3.22
+
+# Timezone
+TZ=UTC
+
+# Server configuration
+NGINX_HOST=localhost
+NGINX_PORT=80
+
+# Port overrides (optional)
+# NGINX_HTTP_PORT_OVERRIDE=80
+# NGINX_HTTPS_PORT_OVERRIDE=443