Update LiveObjects object retention to reflect configurable duration

[AndyTWF]

Summary

• LiveObjects object retention is no longer fixed at 90 days — it's now configurable between 24 hours and 90 days (defaulting to 90 days)
• Updated the storage page and LiveObjects overview to reflect the configurable retention range
• Replaced the "contact us for configurable durations" aside with guidance to contact Ably for retention periods longer than 90 days

🤖 Generated with Claude Code

DX-1034

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