Update deploy scripts for Azure Managed Redis defaults

[paullizer]

Summary

Update the deployment scripts to provision Azure Managed Redis by default and define the standard configuration for new SimpleChat installations.

Scope

• Evaluate and document the default Azure Managed Redis configuration we should provision.
• Decide the default data tier, cache size, performance tier, and any advanced configuration required for production-ready deployments.
• Evaluate active geo-replication support and determine whether it should be enabled by default, optional, or gated by deployment profile/region support.
• Update the deploy scripts and related deployment configuration to use Azure Managed Redis instead of assuming Azure Cache for Redis.
• Preserve a support path for existing Azure Cache for Redis deployments during the transition period.

Acceptance Criteria

• Deployment defaults for Azure Managed Redis are documented and reviewed, including data tier, cache size, performance, geo-replication, and advanced settings.
• Deploy scripts provision/configure Azure Managed Redis with the selected defaults.
• Configuration remains explicit about compatibility or migration behavior for existing Azure Cache for Redis users.
• Deployment documentation and validation steps are updated.

Notes

Priority: P1
Assignee: Unassigned
Related follow-up: ensure the application Redis implementation and admin portal support both Azure Managed Redis and Azure Cache for Redis during the transition.