Add configurable Anthropic prompt cache TTL settings

[chnn19]

Description

This PR adds configurable Anthropic prompt cache TTL settings.

Previously, Chatbox always used the default prompt cache TTL. This change allows users to choose the cache duration for Claude conversations from the session settings.

Changes

• Add a new Prompt Cache setting for Claude sessions.
• Support three modes:
  • Auto
  • 5 minutes
  • 1 hour
• Pass the selected TTL to Anthropic using the cache_control.ttl field.
• Preserve the existing automatic behavior when Auto is selected.

Additional Notes

The implementation was tested with the Anthropic API using both 5m and 1h TTL values.

No screenshots are included because the UI change is limited to a single additional session setting.

Screenshots

N/A

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