Add ingress rate limiting and timeout annotations

[vcarl]

Context

Part of load balancer architecture work (see PR #228 for full analysis).

Risk: Very Low | Reward: Medium | Code Changes: None

Description

Add rate limiting and timeout annotations to existing ingress for improved resilience.

Changes

Add to cluster/ingress.yaml annotations:

nginx.ingress.kubernetes.io/proxy-connect-timeout: "60"
nginx.ingress.kubernetes.io/proxy-send-timeout: "60"
nginx.ingress.kubernetes.io/proxy-read-timeout: "60"
nginx.ingress.kubernetes.io/limit-rps: "100"

Why This is Safe

Standard nginx-ingress features, doesn't touch app code.

Tasks

• Add timeout annotations to ingress
• Add rate limiting annotation
• Deploy to staging and verify
• Deploy to production

References

• PR Architecture analysis: Load balancing with SQLite constraint #228 (architecture analysis)
• cluster/proposed/ingress.yaml has the proposed config