feat: use redis pool

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What does this PR do?

🤖[deprecated] Generated by Copilot at c3a89b6

This pull request replaces the old Redis client library, ioredis, with a new one, ts-ioredis-pool, that supports TypeScript and connection pooling. This improves the performance, scalability, and resource management of the API. All the routes that use Redis operations are updated to use the new library and the connection pool. The file createRedisClient.ts is deleted as it is no longer needed. The file pnpm-lock.yaml is updated to reflect the new dependencies.

Related issues

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking small changes to existing functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Explanation of the changes

🤖[deprecated] Generated by Copilot at c3a89b6

• Remove ioredis and add ts-ioredis-pool as the Redis client library for the API (link, link, link, link, link, link, link, link, link, link, link)
• Replace createRedisClient with redisPool in all API routes that use Redis (link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link)
• Replace createRedisClient with redisPool.getConnection in all API handlers that use Redis (link, link, link, link, link, link, link, link, link, link, link, link, link)
• Delete createRedisClient utility function as it is no longer used (link)

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