Split contest results into teacher management and participant views

[Copilot]

The contest results page was mixing teacher/admin management functionality with participant-facing results, causing confusion about data visibility and access control.

Changes

Teacher/Admin Results (/dashboard/teacher/contests/[contestId]/results)

• New page showing full leaderboard with all participant names and scores
• Fetches aggregated stats from /contests-management/contests/{id}/user-stats
• Displays contest-wide metrics (total participants, submissions, tasks solved, avg score)
• Access controlled via existing contest collaborator validation

Participant Results (/dashboard/user/contests/[contestId]/results)

• Removed leaderboard showing other participants
• Only displays current user's results via /contests/{contestId}/results/my
• Shows personal score, task completion, and submission breakdown

Remote Query Changes

// Teacher: fetches all participant stats
const [userStats, contest] = await Promise.all([
  contestsManagementService.getUserStats(params.contestId),
  contestService.getContest(params.contestId)
]);

// Participant: fetches only personal results
const myResults = await contestService.getMyResults(params.contestId);

Translations

Added teacher-specific i18n keys (teacher_contest_results_*) in English and Polish.

Warning

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• eu.posthog.com
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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Contests Result page</issue_title>
<issue_description>Current implementation of contest results is a complete implmenetation mess. What we want is:

• Contest results page for only teachers/admins which looks the same as current /user/contests/results page but is only accessable for contest collaborators. Endpoint should be /contests-management/contests/ one's which are only available for manager,s there is differnet ypes of aggregates returned.
• Contest results page for participants, which should only return Results for user using /contests/id/results/my endpoint results of only curreny user.
• In the future we will implement page for users but with all results available with redacted names of other participants.
  For now only first and second types of pages should be implmeneted. </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Contests Result page #133

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