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feat(annotations): add custom annotation prefix support for split horizon DNS (#5889)

* feat(annotations): add custom annotation prefix support for split horizon DNS

Add --annotation-prefix flag to allow customizing the annotation prefix
used by external-dns. This enables split horizon DNS scenarios where
multiple instances process different sets of annotations from the same
Kubernetes resources.

Changes:
- Add AnnotationPrefix field to Config with validation
- Convert annotation constants to variables that can be reconfigured
- Add SetAnnotationPrefix() function to rebuild annotation keys
- Integrate annotation prefix setting in controller startup
- Update Helm chart with annotationPrefix value
- Add comprehensive split horizon DNS documentation
- Update FAQ with annotation prefix examples

This maintains full backward compatibility - the default prefix remains
"external-dns.alpha.kubernetes.io/".

Co-Authored-By: Claude <noreply@anthropic.com>

* docs(advanced): fix markdown formatting in split-horizon guide

Add blank lines before code blocks to improve markdown rendering
and comply with markdownlint rules.

Co-Authored-By: Claude <noreply@anthropic.com>

* docs(advanced): fix markdown formatting in split-horizon guide

Co-Authored-By: Claude <noreply@anthropic.com>

* docs(charts): regenerate Helm chart documentation

Co-Authored-By: Claude <noreply@anthropic.com>

* test: add AnnotationPrefix field to test configs

Add missing AnnotationPrefix field to minimalConfig and overriddenConfig
test configurations to match the new default value set in NewConfig().

Co-Authored-By: Claude <noreply@anthropic.com>

* test(charts): update error pattern in json-schema test

Update expected error message pattern to match current Helm validation
output format.

Co-Authored-By: Claude <noreply@anthropic.com>

* refactor(annotations): remove init() for explicit initialization

- Remove init() function from annotations package
- Add explicit SetAnnotationPrefix... (continued)

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Source Files on job run-ubuntu-latest - 19192679165.2