Replace sandbox T3 editor with code-server

[Iweisc]

Summary

• replace the sandbox editor runtime with code-server on port 3773
• add dedicated editor URL plumbing and editor password handling for sandboxes
• route the Editor tab to editorUrl and surface editor credentials in the network dialog
• switch default runtime image references to GHCR and add focused runtime/url tests

Verification

• bash runtime/entrypoint.test.sh
• bash runtime/build.test.sh
• node --test lib/k8s/sandbox-endpoints.test.ts
• node --test components/terminal/toolbar/network-endpoints.test.ts

[github-actions]

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Commit: d8fe4fae97482cf002ebf93953cc83f74acb2684
Branch: codeserver-editor-upstream

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[fanux]

@Iweisc This looks like a pretty good features.

[Iweisc]

@fanux Ah! It was supposed to be for my own fork! but my agent automatically opened the PR, extremely sorry.

[Iweisc]

@fanux It doesn't properly work right now, because i kind of abandoned it um but if u insist i can finish this feature.

[fanux]

If you’re interested, you can join to help maintain this repository. I can set you as a maintainer.

[Iweisc]

@fanux sounds like a plan.