feat: add eliminated teams tracking to leaderboard, optimize data fetching, and configure Netlify build settings

[AdhwaithAS]

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[greptile-apps]

Greptile Summary

This PR adds eliminated-team tracking and updates several frontend, API, caching, and deployment paths. The main changes are:

• Marks eliminated teams on leaderboards and excludes them from registration.
• Adds avatar uploads to the profile editor and expands accepted image formats.
• Removes the prediction requirement from profile-task verification.
• Adds visibility-aware leaderboard polling and response caching.
• Configures Netlify builds for the Next.js frontend.

Confidence Score: 5/5

This looks safe to merge.

• No new blocking issue distinct from the existing findings was found in the updated code.

Important Files Changed

Filename	Overview
frontend/utils/constants.js	Adds shared eliminated-team and available-team lists.
frontend/app/api/v1/register/route.js	Uses the available-team list for server-side registration validation.
frontend/app/profile/[id]/components/useProfileState.js	Updates avatar validation, input reset behavior, and modal integration.
frontend/utils/football-api.js	Adds five-minute revalidation to match-data fetches.
frontend/app/api/v1/live-stats/route.js	Removes referral analytics and adds shared-cache response headers.
netlify.toml	Configures root-level Netlify builds for the frontend.

_{Reviews (2): Last reviewed commit: "chore: disable secrets scanning in Netli..." | Re-trigger Greptile}

[greptile-apps]

Avatar Size Limits Conflict

Images between 3 MB and 5 MB pass this new client check, but the unchanged API limit rejects them at 3 MB. The modal advertises 5 MB, so users can select a supposedly valid image only to have the upload fail.

Suggested change

	if (file.size > 5 * 1024 * 1024) {
	setUploadError("Image must be under 5MB.");
	if (file.size > 3 * 1024 * 1024) {
	setUploadError("Image must be under 3MB.");

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