Migrate session store to Redis

[AnExiledDev]

Motivation

The current in-memory SessionStore class in src/api/utils/sessionStore.js loses all sessions on restart and doesn't scale across multiple bot instances.

Code review findings: S-M5, A-H3, A-H5 (Priority: P3)

Scope

• Add ioredis dependency
• Create RedisSessionStore with the same interface as the current SessionStore
• Configure via REDIS_URL environment variable
• Fall back to in-memory store when Redis is not configured
• Add TTL-based expiry in Redis (replace manual cleanup interval)

Key Files

• src/api/utils/sessionStore.js — current in-memory implementation

[coderabbitai]

🔗 Related PRs

#14 - feat: PostgreSQL-backed config persistence [merged]
#59 - feat: User Memory via mem0 (Issue #24) [merged]

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