[Backend] Implement caching strategy for frequently accessed read endpoints

[Penielka]

Overview

Design and implement a multi-tier caching strategy (in-memory + Redis) for high-traffic read endpoints.

Acceptance Criteria

• Cache-aside pattern for course listings, credentials, profiles
• Configurable TTL per endpoint
• Cache invalidation on writes
• Cache hit/miss metrics
• Graceful degradation when cache is unavailable

Priority: Medium

Improves response times and reduces database load.

[barry01-hash]

I would love to work on this issue

[jobbykings]

can i be assined this

[grantfox-oss]

🦊 GrantFox — @jobbykings has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #263)
2. Your PR will be reviewed by the AetherEdu maintainers

Good luck! Track your progress on GrantFox.