Refactor: Convert array-like tables to hashtables

[google-labs-jules[bot]]

This pull request refactors the addon to use hashtables for lists that are frequently searched, significantly improving performance. The primary changes are:

• Converted the friends table from an array to a hashtable, replacing inefficient table.HasValue calls with direct key lookups.
• Implemented a data migration function to seamlessly transition existing save data to the new format.
• Removed the redundant friendsname table, as the UI can now dynamically generate friend names.
• Added extensive nil-safety checks to prevent errors when a house has no friends list.
• Created a shared utility function, ghomes.utils.arrayToHashtable, to handle the conversion.

These changes will reduce server load and improve the overall user experience by making the addon more responsive.

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PR created automatically by Jules for task 12350407595810257628

[google-labs-jules[bot]]

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