perf(billing,settlement): paginate claims and wallet transactions (H9, H10)

GET /billing/claims loaded every tenant claim with no limit. Add
findByTenant(page, limit) + countByTenant (shared query builder), default
limit 50 / max 100, and expose totals as data.meta — kept inside the existing
{ data: { data: [...] } } envelope so current clients are unaffected.

GET /wallet/transactions was already bounded (findByUser defaulted to limit 50)
but page-less; add page/offset + countByUser + the same additive meta.

Regression: tests/Billing/ClaimsListPaginationTest,
tests/Settlement/WalletTransactionsPaginationTest.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/Settlement/Repository/WalletTransactionRepository.php

@@ -15,9 +15,14 @@ class WalletTransactionRepository extends ServiceEntityRepository
     }
 
     /** @return WalletTransaction[] */
-    public function findByUser(User $user, int $limit = 50): array
+    public function findByUser(User $user, int $limit = 50, int $offset = 0): array
     {
-        return $this->findBy(['user' => $user], ['createdAt' => 'DESC'], $limit);
+        return $this->findBy(['user' => $user], ['createdAt' => 'DESC'], $limit, $offset);
+    }
+
+    public function countByUser(User $user): int
+    {
+        return $this->count(['user' => $user]);
     }
 
     public function save(WalletTransaction $entity, bool $flush = true): void