stack: drop env-driven filehost, switch panel to ValwareIRC webpanel

[ValwareIRC]

FILEHOST_URL was a vestige of the obbyircd container's pre-runtime
filehost render. obbyircd now expects an operator-edited filehosts {}
block in obbyircd.conf, so the env var has no consumer. Dropped from
.env.example and replaced the comment with a pointer to the conf block.

Panel image: obbyworld/webpanel:0.1.0 was the legacy panel. Repointed at
ghcr.io/valwareirc/unrealircd-webpanel-2:latest (modern Go+React rewrite,
multi-arch). Source: ValwareIRC/unrealircd-webpanel-2.

Summary by CodeRabbit

• Documentation

  • Updated environment configuration examples with the latest web panel image reference.
  • Clarified that filehost settings are configured at runtime rather than through environment variables.

• Chores

  • Updated default container image source and version for the web panel service.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

📝 Walkthrough

Walkthrough

This PR updates container image references and environment variable documentation. The FILEHOST_URL environment variable is removed from .env.example with guidance that filehosts are configured at runtime. The obby-panel service image reference is updated from obbyworld/webpanel to ghcr.io/valwareirc/unrealircd-webpanel-2 across both configuration files.

Changes

Configuration and Image Reference Update

Layer / File(s)	Summary
Image references and environment variable updates .env.example, compose.yaml	FILEHOST_URL removed with documentation indicating runtime configuration via obbyircd.conf; OBBY_PANEL_IMAGE example updated to ghcr.io/valwareirc/unrealircd-webpanel-2:latest in both .env.example and compose.yaml service definition with renovate metadata updated.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A registry switch, clean and bright,
From obbyworld to the ghcr light,
Filehosts find their rightful place,
In config files, setting the pace! 🔧

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the two main changes: removing the env-driven filehost configuration and switching the panel image to ValwareIRC's webpanel.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cleanup-filehost-env-and-panel-image

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