feat: add NIP-25 reactions support

[CKodidela]

Description

Implements NIP-25 (Reactions) support for kind 7 (nostr event reactions) and kind 17 (external content reactions).

• Added EXTERNAL_CONTENT_REACTION = 17 to EventKinds and new tags (Address, Index, Emoji) to EventTags
• Added ReactionEntry type to @types/event
• Created src/utils/nip25.ts with isReactionEvent, isExternalContentReactionEvent, isLikeReaction,
  isDislikeReaction, and parseReaction helpers
• Schema validation: kind 7 must include at least one e tag; kind 17 must include k and i tags
• Wired reaction event types into event-strategy-factory

Related Issue

N/A

Motivation and Context

NIP-25 defines how clients express reactions (likes, dislikes, emoji) to notes and external content. This adds
relay-side support for storing, validating, and querying reaction events.

How Has This Been Tested?

• Unit tests for all utility functions (isReactionEvent, isLikeReaction, isDislikeReaction, parseReaction,
  etc.)
• Unit tests for schema validation (valid/invalid kind 7 and kind 17 events)
• Unit tests for event strategy factory routing
• Integration tests covering like, dislike, and emoji reaction scenarios
• All existing tests continue to pass

Screenshots (if appropriate):

N/A

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.

[changeset-bot]

🦋 Changeset detected

Latest commit: 2ca0afc

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
nostream	Minor

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[coveralls]

coverage: 64.306% (+0.3%) from 64.015% — CKodidela:feat/nip25 into cameri:main