[GangDev6707]

Summary

Adds deterministic unit test coverage for parseCappedLimit handling empty filters, nulls, non-primitive values, and conflicting operators in query parameters:

• Empty query objects, missing parameters, and empty or whitespace strings fallback to defaultLimit.
• Explicit null values, boolean query values, and NaN fallback to defaultLimit.
• Conflicting duplicate parameter arrays (e.g. ?limit=10&limit=50) and nested operator objects (e.g. ?limit[gte]=10) safely fallback to defaultLimit.
• Boundary testing: minimum valid limit (1), within bounds (50), exact MAX_LIMIT (100), just above limit (101), and massive integer capping.
• Invalid numeric boundaries: zero, negative values, decimals, and Infinity safely fallback to defaultLimit.
• Custom defaultLimit overrides.

Test Coverage

• npm test -- src/utils/__tests__/queryHelpers.test.ts: 22/22 tests passing 100% green.
• npm run build: 0 errors.
• npm run lint: 0 errors.

Closes #2087