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Previously every account without a custom avatar automatically got its email MD5-hashed and sent to gravatar.com at signup, with no way to turn it off. Adds users.useGravatar (default false): removed the automatic signup-time lookup entirely, and "remove photo" now falls back to the initials placeholder instead of silently re-deriving a Gravatar URL. New toggle in Settings -> Profile, off by default, description explains the MD5-hash-to-third-party tradeoff. Existing accounts' current avatarUrl is left untouched either way — no retroactive avatar changes for anyone already using one. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>