Fix Podman Local VM image resolution

[milind-soni]

What changed

• Tag the locally built Cua VM image under the explicit localhost/ registry.
• Add a regression test ensuring Podman commands keep the image local and never resolve it through Docker Hub.

Why

Podman prepends localhost/ to unqualified image names produced by podman build. OpenMausBot later referred to the same image without that prefix, so Podman could miss the local build and try to pull docker.io/openmausbot/cua-local-vm, which does not exist publicly.

This fixes #231.

Validation

• pnpm vitest run server/container-computer.test.ts — 26 passed
• pnpm typecheck — passed
• pnpm test — 103 Vitest files / 1,013 tests passed, broker tests passed, updater tests passed, packaged-server smoke passed

The focused anti-slop lint command continues to report existing findings elsewhere in the two files; the changed lines introduce no new lint findings.

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📥 Commits

Reviewing files that changed from the base of the PR and between 9cee900 and cd38ed0.

📒 Files selected for processing (2)

• server/container-computer.test.ts
• server/container-computer.ts

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