Add caching for Alkanes tokens to improve performance

[iwashimm]

Pull Request

Description

This PR adds a caching system for Alkanes tokens to improve performance and reduce API calls. The implementation includes a visual indicator showing whether data is from cache or freshly fetched, and proper cache invalidation mechanisms.

Related Issue

N/A (or reference the issue number if there was one)

Type of Change

• New feature (non-breaking change which adds functionality)
• Performance improvement

Testing Performed

• Loaded the Alkanes Tokens Explorer page and verified data was fetched from API
• Navigated away and returned to verify cached data was used
• Tested the cache status indicator to confirm it displays "Fresh" or "Cached" correctly
• Verified the refresh button clears cache and fetches fresh data
• Tested pagination with caching to ensure correct data display

Screenshots

Checklist

• My code follows the code style of this project
• My changes generate no new warnings
• I have checked that my code does not include any sensitive data