## What this PR does
Fixes two independent issues found during cluster operations:
**http-cache (HAProxy 3.3 breaking change)**
HAProxy 3.3 no longer allows a frontend and backend to share the same
name. The existing config had both `frontend http` and `backend http`,
which causes haproxy to refuse to start on upgrade. Rename `backend
http` → `backend cache` and update the `default_backend` directive
accordingly.
**vpa-for-vpa (OOMKilled recommender)**
The VPA recommender deployed by `vpa-for-vpa` was hitting its 512Mi
memory limit and being OOMKilled. Increase the limit to 1Gi to keep the
recommender running stably.
### Release note
```release-note
fix(http-cache): rename haproxy backend to avoid HAProxy 3.3 name conflict between frontend and backend
fix(vpa): increase vpa-for-vpa recommender memory limit from 512Mi to 1Gi to prevent OOMKilled restarts
```
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Bug Fixes**
* Corrected HAProxy routing so HTTP traffic is directed to the cache
backend.
* Increased the VPA recommender’s memory limit to improve reliability
under higher workloads.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
IvanHunters
f077420fbe