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/tidb/README.md

@@ -0,0 +1,95 @@
+# TiDB
+
+TiDB is an open-source, cloud-native, distributed SQL database designed for modern applications. It is MySQL compatible and provides horizontal scalability, strong consistency, and high availability.
+
+## Usage
+
+```bash
+docker compose up -d
+```
+
+## Components
+
+This setup includes:
+
+- **PD (Placement Driver)**: Manages and schedules TiKV
+- **TiKV**: Distributed transactional key-value storage
+- **TiDB**: Stateless SQL layer
+
+## Ports
+
+- `4000`: TiDB MySQL protocol port
+- `10080`: TiDB status and metrics port
+- `2379`: PD client port
+- `20160`: TiKV port
+
+## Access
+
+### MySQL Client
+
+TiDB is compatible with MySQL protocol:
+
+```bash
+mysql -h127.0.0.1 -P4000 -uroot
+```
+
+### Example Usage
+
+```sql
+-- Create database
+CREATE DATABASE test;
+USE test;
+
+-- Create table
+CREATE TABLE users (
+    id INT PRIMARY KEY,
+    name VARCHAR(50),
+    email VARCHAR(100)
+);
+
+-- Insert data
+INSERT INTO users VALUES (1, 'Alice', 'alice@example.com');
+
+-- Query data
+SELECT * FROM users;
+```
+
+### Status and Metrics
+
+Check TiDB status:
+
+```bash
+curl http://localhost:10080/status
+```
+
+## Features
+
+- **MySQL Compatible**: Drop-in replacement for MySQL
+- **Horizontal Scalability**: Scale out by adding more nodes
+- **Strong Consistency**: ACID transactions across distributed data
+- **High Availability**: Automatic failover with no data loss
+- **Hybrid Transactional/Analytical Processing (HTAP)**: Both OLTP and OLAP workloads
+
+## Notes
+
+- This is a minimal single-node setup for development
+- For production, deploy multiple PD, TiKV, and TiDB nodes
+- Consider adding TiFlash for analytical workloads
+- Monitor using Prometheus and Grafana for production deployments
+- Data is persisted in named volumes
+
+## Advanced Configuration
+
+For production deployments, consider:
+
+- Using separate machines for PD, TiKV, and TiDB
+- Deploying at least 3 PD nodes for high availability
+- Deploying at least 3 TiKV nodes for data replication
+- Adding TiFlash for columnar storage and faster analytical queries
+- Setting up monitoring with TiDB Dashboard, Prometheus, and Grafana
+
+## References
+
+- [TiDB Official Documentation](https://docs.pingcap.com/tidb/stable)
+- [TiDB Quick Start](https://docs.pingcap.com/tidb/stable/quick-start-with-tidb)
+- [TiDB Docker Images](https://hub.docker.com/u/pingcap)