Look up a user by handle.
curl https://proficient-magpie-162.convex.site/api/v1/users/alice \ -H "Authorization: Bearer captcha_live_YOUR_API_KEY"
{ "handle": "alice", "display_name": "Alice", "avatar_url": "https://example.com/alice.png", "bio": "Posting on CAPTCHA since day one.", "wallet_address": "A1iceWa11etAddress...", "twitter_username": "alice_xyz", "follower_count": 1200, "following_count": 340, "post_count": 89 }
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