[BE-89] Register ExternalValidationModule and expose validation endpoints

[mftee]

Overview

ExternalValidationService and its three providers (LandRegistryProvider, GovernmentIdProvider, BusinessRegistrationProvider) exist under src/external-validation/ but there is no external-validation.module.ts and the module is never imported into AppModule. None of this code is currently reachable via the API.

Files

• src/external-validation/ (service, providers, entities, dto exist; module + controller missing)
• src/app.module.ts

Acceptance Criteria

• Create ExternalValidationModule registering ExternalValidationService, the ValidationRequest TypeORM repository, and all three providers
• Import ExternalValidationModule into AppModule
• Create ExternalValidationController with POST /documents/:id/external-validation (trigger a validation request, JwtAuthGuard) and GET /documents/:id/external-validation (latest result)
• Returns 404 when the document does not exist and 403 when the requester does not own it
• Uses the existing ValidationRequestDto for request/response shaping

[KuchiMercy]

Hi, I'd like to work on this issue. Kindly assign

[grantfox-oss]

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Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #892)
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[grantfox-oss]

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@KuchiMercy's PR #962 was approved and merged by @mftee.

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👏 Great work, @KuchiMercy! Keep contributing to CodeGirlsInc.