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- Update outdated comments referencing deprecated features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/d1.ts

@@ -34,7 +34,7 @@ export class D1Storage implements Storage {
    */
   async initializeDatabase(): Promise<void> {
     await 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,
@@ -125,7 +125,7 @@ export class D1Storage implements Storage {
 
     // D1 doesn't support true transactions yet, so we do this sequentially
     for (const offer of offers) {
-      const id = offer.id || await generateOfferHash(offer.sdp, []);
+      const id = offer.id || await generateOfferHash(offer.sdp);
       const now = Date.now();
 
       await this.db.prepare(`