docs: add HPC-AI integration page

[lioZ129]

Summary

• add the HPC-AI integration landing page to haystack-integrations
• include installation, configuration, supported models, docs link, repo link, and logo
• add HPC-AI website metadata and overview copy

Notes

• HPC-AI is compatible with the OpenAI API
• supported models: minimax/minimax-m2.5 and moonshotai/kimi-k2.5

[Copilot]

Pull request overview

Adds a new documentation landing page for the HPC-AI Haystack integration, including metadata, usage guidance, and branding assets.

Changes:

• Added integrations/hpc-ai.md integration page with installation and usage examples.
• Added HPC-AI logo asset under logos/hpc_ai.svg.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
logos/hpc_ai.svg	Adds HPC-AI logo asset for use on the integrations site.
integrations/hpc-ai.md	New integration landing page describing the HPC-AI provider and HPCAIChatGenerator usage.

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[lioZ129]

Two related pr:

• feat: add HPC-AI model provider support haystack-core-integrations#3109
• docs: add HPC-AI chat generator docs haystack#11048