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- Update outdated comments referencing deprecated features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/storage/sqlite.ts

@@ -36,7 +36,7 @@ export class SQLiteStorage implements Storage {
    */
   private initializeDatabase(): void {
     this.db.exec(`
-      -- Offers table (no topics)
+      -- WebRTC signaling offers
       CREATE TABLE IF NOT EXISTS offers (
         id TEXT PRIMARY KEY,
         peer_id TEXT NOT NULL,
@@ -132,7 +132,7 @@ export class SQLiteStorage implements Storage {
     const offersWithIds = await Promise.all(
       offers.map(async (offer) => ({
         ...offer,
-        id: offer.id || await generateOfferHash(offer.sdp, []),
+        id: offer.id || await generateOfferHash(offer.sdp),
       }))
     );