docs: document config-db default retention periods

[Copilot]

Documents the default retention periods applied by config-db when no explicit retention rules are configured.

Changes

• Added "Default Retention Periods" section to /docs/guide/config-db/concepts/retention documenting:
  • Config Items: 7 days
  • Changes: 60 days
  • Config Analysis: 60 days
• Fixed pre-existing hard tab in code example

Values sourced from github.com/flanksource/config-db/jobs/cleanup.go constants.

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Document config-db default retention period</issue_title>
<issue_description>```
const (
DefaultConfigAnalysisRetentionDays = 60
DefaultConfigChangeRetentionDays = 60
DefaultConfigItemRetentionDays = 7
)

github.com/flanksource/config-db/jobs/cleanup.go

Use this as a reference and document that in `/docs/guide/config-db/concepts/retention`</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes Document config-db default retention period #440

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Project	Deployment	Preview	Updated (UTC)
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