[Contests] Use per-user endpoint for profile tab + has-contest gate

[dylanjeffers]

Summary

• The profile Contests tab and the useUserHasRemixContest gate both fetched the global remix-contests list and filtered client-side by host userId, paginating up to 5 pages of 50 to avoid false-empty rendering.
• Switch both to the new GET /v1/users/{id}/contests endpoint via a new useUserRemixContests hook. The has-contest gate becomes a single pageSize=1 query, and the tab drops the per-row HostedContestCard filter and the auto-pagination effect.
• SDK regen picked up users.getContestsByUser and GetContestsByUserStatusEnum.

Companion PR

• Backend: [Contests] Add GET /v1/users/{id}/contests endpoint api#791

Test plan

• Visit a profile that hosts an active contest — Contests tab renders with the contest card.
• Visit a profile that hosts only an ended contest — tab renders with the ended card.
• Visit a profile that hosts no contests — empty state shows immediately (no spinner waiting on global pagination).
• Confirm the tab strip itself only appears for hosts (useUserHasRemixContest gate).
• DevTools: confirm the request is /v1/users/{id}/contests and not /v1/events/remix-contests.

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