Add a deep-check mode to the health endpoint

[Akatenvictor]

Problem / Context

The current health endpoint likely reports process liveness only; add a mode that verifies DB/Redis/RabbitMQ/S3 reachability.

Proposed approach

Add a ?deep=true (or separate /health/deep) mode that checks each dependency and reports per-dependency status.

Acceptance criteria

• Deep check reports per-dependency status
• Shallow default check remains fast for platform liveness probes
• Covered by a test

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@Akatenvictor This issue could not be added to the Stellar Wave Program because the per-repo points budget would be exceeded (25000 / 25000 points already used). The label has been automatically removed.

The budget resets at the end of each Wave. You can review the remaining budget for your repos on the Orgs & Repos page.

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[drips-wave]

@Akatenvictor This issue could not be added to the Stellar Wave Program because the per-repo points budget would be exceeded (25000 / 25000 points already used). The label has been automatically removed.

The budget resets at the end of each Wave. You can review the remaining budget for your repos on the Orgs & Repos page.

ℹ️ Learn more about points budgets

[drips-wave]

@Akatenvictor This issue could not be added to the Stellar Wave Program because the per-repo points budget would be exceeded (25000 / 25000 points already used). The label has been automatically removed.

The budget resets at the end of each Wave. You can review the remaining budget for your repos on the Orgs & Repos page.

ℹ️ Learn more about points budgets