Remove legacy V1 code and clean up unused remnants

- Delete unused bloom.ts module (leftover from topic-based discovery)
- Remove maxTopicsPerOffer configuration (no longer used)
- Remove unused info field from Offer types
- Simplify generateOfferHash() to only hash SDP (remove topics param)
- Update outdated comments referencing deprecated features
- Remove backward compatibility topics field from answer responses

This completes the migration to V2 service-based architecture by
removing all remnants of the V1 topic-based system.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/index.ts

@@ -20,7 +20,6 @@ async function main() {
     offerMinTtl: `${config.offerMinTtl}ms`,
     cleanupInterval: `${config.cleanupInterval}ms`,
     maxOffersPerRequest: config.maxOffersPerRequest,
-    maxTopicsPerOffer: config.maxTopicsPerOffer,
     corsOrigins: config.corsOrigins,
     version: config.version,
   });