refactor(ocpp): harmonize JSON schema payload validation across OCPP stacks

refactor(ocpp): harmonize JSON schema payload validation across OCPP stacks

- Absorb missing-validator null guard into base class methods, eliminating
  4 identical private validatePayload wrappers and their bind() calls
- Remove dead code (unreachable isValid branches in ResponseService wrappers)
- Make parseJsonSchemaFile throw on failure instead of silently returning {},
  preventing validators that accept everything as a security bypass
- Add dual-path schema resolution for production (esbuild) and test (tsx)
- Align OCPP 1.6 schema map construction with OCPP 2.0 registry pattern,
  replacing ~200 lines of verbose inline entries with declarative registries
- Collapse 4 identical payload options factory methods into 1 per version