feat(dvm): add NIP-89 handler recommendation and information kinds

[Priyanshubhartistm]

Description

Adds NIP-89 discovery for DVM job requests: named EventKinds constants HANDLER_RECOMMENDATION = 31989 and HANDLER_INFORMATION = 31990, plus tests confirming both are already passively accepted, served, and replaced correctly.

• Both kinds sit inside the existing parameterized-replaceable range (30000-39999), so
  ParameterizedReplaceableEventStrategy already handles create/replace/serve for them no new handler code, only named constants for clarity.
• The relay does not author its own kind-31990 on behalf of locally-registered workers, and there is no heartbeat/withdraw-on-crash publishing subsystem — confirmed out of scope for passive-only discovery.
• 2 unit tests in event-strategy-factory.spec.ts confirm both kinds route to
  ParameterizedReplaceableEventStrategy.
• 6 integration scenarios (test/integration/features/nip-89/) cover, for each kind: create + serve, replace-on-d-tag-collision, and kind-only REQ filter discovery.

Related Issue

Part of #639. Closes #736.

Motivation and Context

Job requests (#729), persistence (#727), and dispatch (#731) exist, but there was no way for clients to discover which DVMs a relay's workers can talk to. Passive accept-and-serve (over relay-authored handler-info with a heartbeat) was the scope confirmed with the maintainer.

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Latest commit: d41f8c6

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[coveralls]

coverage: 71.001% (+0.008%) from 70.993% — Priyanshubhartistm:feat/dvm-nip89-discovery into cameri:main