Repo cleanup: Java 21, remove stale files, gitignore

[Jaben]

Summary

• Upgrade Dockerfile from Java 17 to Java 21 (current LTS)
• Update docker-compose.arm.yml app image to use repo's GHCR image
• Remove .github/FUNDING.yml (upstream artifact)
• Remove deep-devops-drama.txt
• Remove .claude/settings.local.json and add *.local.json to .gitignore

Test plan

• Verify Docker image builds with Java 21
• Verify docker compose up works with ARM compose file

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 2e9202ab-3cb8-413a-a23c-744e55cb2e30

📥 Commits

Reviewing files that changed from the base of the PR and between f0a8de6 and e8f4a0c.

📒 Files selected for processing (7)

• .claude/settings.local.json
• .github/FUNDING.yml
• .gitignore
• Dockerfile
• deep-devops-drama.txt
• docker-compose.arm.yml
• src/cljs/swarmpit/component/header.cljs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/repo-cleanup

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