Add status page badges

[jbrooksuk]

Summary

Adds cacheable SVG badges for the overall status page and individual public components.

• Introduces /badge.svg and /components/{component}/badge.svg beneath the configured Cachet path.
• Uses Badger 5.0 to generate SVG output, with supported style selection via ?style=.
• Uses dedicated invokable controllers for system and component badges.
• Keeps status-to-badge-color mappings on the relevant enums, with unit coverage.
• Returns 404 for disabled components and components in non-public groups.

Validation

• vendor/bin/pest tests/Feature/StatusPage/StatusPageTest.php tests/Unit/StatusBadgeColorTest.php --compact (33 passed)
• vendor/bin/pint for changed files
• composer validate --no-check-publish

The full parallel test command was also attempted earlier but an unrelated subscriber test worker exceeded its fixed 128 MB memory limit.

[chatgpt-codex-connector]

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Reviewed commit: 844bfd6afd

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[chatgpt-codex-connector]

Obtain approval before adding Badger

This introduces cachethq/badger as a new runtime dependency, but the repository explicitly prohibits adding dependencies without prior approval, and the reviewed change provides no evidence of that approval. Obtain and document approval or use an existing approved dependency before merging.

AGENTS.md reference: AGENTS.md:L20-L24

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