fix(service): fix librechat healthcheck and upgrade meilisearch image tag

[GauthierPLM]

Changes

• Fixed librechat' healthcheck by switching to the right URL.
• Upgraded meilisearch image version to match the official template.

Issues

Category

• Bug fix
• Improvement
• New feature
• Adding new one click service
• Fixing or updating existing one click service

Preview

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• AI was used (please describe below)

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Testing

Deploy the template as it ; the healthcheck now works.

Contributor Agreement

Important

• I have read and understood the contributor guidelines. If I have failed to follow any guideline, I understand that this PR may be closed without review.
• I have searched existing issues and pull requests (including closed ones) to ensure this isn't a duplicate.
• I have tested all the changes thoroughly with a local development instance of Coolify and I am confident that they will work as expected when a maintainer tests them.