feat(scoring): accrue server-side for the ~85 checked quiz modules (#91)

[lucky-pluton]

Closes #91 — Part of the #87 scoring-ledger epic.

TL;DR

Quiz coins and solved counts were previously computed in the client browser and trusted by the server. This PR wires the atomic
ecordEvent()\ ledger writer into the global \POST /-api/check\ middleware choke point so that coins, XP, and totalSolved accrue authoritatively on the server across all ~85 quiz modules.

Changes

• Update the global \POST /-api/check\ middleware in \server/index.js\ to invoke
  ecordEvent\ for logged-in users on verified check responses.
• Attach updated totals (\coins, \xp, \ otalSolved, \coinsEarned, \xpEarned) to the response object.
• Add \server/tests/quizAccrual.test.js: integration tests confirming that quiz check endpoints trigger
  ecordEvent\ and return updated totals.

Verification

• 
  pm test\ in \server/: 193/193 tests passed.
• 
  px vitest run tests/quizAccrual.test.js: 2/2 tests passed.

[github-actions]

✅ Parikshak — all automated checks pass

• ✅ Linked to open issue Scoring: accrue server-side for the ~85 checked quiz modules #91 — Scoring: accrue server-side for the ~85 checked quiz modules
• ✅ No merge conflict

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