test(nip-11): add integration tests and fix max_filters mapping

[kanishka0411]

Description

Adds integration tests for the NIP-11 relay information document endpoint, plus a one-line bug fix where max_filters was being populated from maxFilterValues (2500) instead of maxFilters (10).

Related Issue

Fixes #508

Motivation and Context

The root HTTP endpoint had zero integration test coverage. Any regression in NIP-11 response shape, supported NIPs list, or limitation values would go undetected.

How Has This Been Tested?

Ran npm run docker:test:integration - all passed including the new NIP-11 scenarios

Screenshots (if appropriate):

Types of changes

• Non-functional change (docs, style, minor refactor)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my code changes.
• I added a changeset, or this is docs-only and I added an empty changeset.
• All new and existing tests passed.

[coveralls]

coverage: 68.472% (+0.2%) from 68.308% — kanishka0411:test/nip-11-integration into cameri:main