#793 Remove duplicate community data prefetching

- Remove duplicate prefetches from sort-page.tsx (layout handles it)
- Remove getSubscribers and getAccountNotifications from SSR prefetch
  (not critical for initial render, client fetches for sidebar)
- Keep only getCommunity in SSR (needed for page metadata)

This reduces redundant API calls per community page visit.

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>