test(admin): add tests for reconciliation status grouping

[thetejuuu]

Overview

This PR adds unit tests for the GET /admin/reconciliation/status aggregation in src/routes/admin.routes.ts. The grouping loop and totalUnresolved count are the only aggregation operators rely on to gauge the unresolved backlog, so this change locks in the expected behavior with a mocked prisma client.

Related Issue

Changes

🧪 Reconciliation Status Tests

• [ADD] src/__tests__/admin.reconciliation.status.test.ts
  • Mocks prisma so reconciliationMismatch.findMany returns controlled fixtures.
  • Covers the empty result case: zero group entries and totalUnresolved: 0.
  • Covers two mismatches in the same group: a single group entry with mismatchCount: 2.
  • Covers mismatches across two groups: two group entries with the correct per-group counts.
  • Asserts totalUnresolved equals the number of returned rows.
  • Asserts the findMany filter includes resolvedAt: null, so resolved rows are excluded from the backlog.

Verification Results

npm test -- src/__tests__/admin.reconciliation.status.test.ts
✅ 4/4 passed

Acceptance Criteria	Status
Test file exists and asserts the four scenarios	✅ Empty, same-group, cross-group, and filter cases covered
totalUnresolved equals the number of returned rows	✅ Asserted in each scenario
Query filter excludes resolved rows	✅ resolvedAt: null asserted on the findMany call
npm test passes locally	✅ Test file passes

Closes #28

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