fix(store): Make username case insensitive

[Swiftyos]

Username was case sensitive, made username case insensitive

[qodo-merge-pro]

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⚡ Recommended focus areas for review Data Consistency Existing usernames in the database may need to be migrated to lowercase to maintain consistency with the new case-insensitive approach Error Handling The new profile creation code returns profile details directly without checking if the creation was successful Code Order The similarAgents query uses agent.categories[0] before agent is defined in the code flow

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