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- Update outdated comments referencing deprecated features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/hash-id.ts

@@ -1,22 +1,17 @@
 /**
  * Generates a content-based offer ID using SHA-256 hash
- * Creates deterministic IDs based on offer content (sdp, topics)
+ * Creates deterministic IDs based on offer SDP content
  * PeerID is not included as it's inferred from authentication
  * Uses Web Crypto API for compatibility with both Node.js and Cloudflare Workers
  *
  * @param sdp - The WebRTC SDP offer
- * @param topics - Array of topic strings
- * @returns SHA-256 hash of the sanitized offer content
+ * @returns SHA-256 hash of the SDP content
  */
-export async function generateOfferHash(
-  sdp: string,
-  topics: string[]
-): Promise<string> {
+export async function generateOfferHash(sdp: string): Promise<string> {
   // Sanitize and normalize the offer content
   // Only include core offer content (not peerId - that's inferred from auth)
   const sanitizedOffer = {
-    sdp,
-    topics: [...topics].sort(), // Sort topics for consistency
+    sdp
   };
 
   // Create non-prettified JSON string