Add domain object classes for nostr event types

Build out @welshman/domain on top of the DomainObject/EncryptableList base
patterns, porting domain-object use cases from @welshman/util and flotilla
that weren't yet represented.

New classes:
- Relay lists: RelayList (NIP-65 read/write markers), Blocked/Search/Messaging
  relay lists, RelaySet (NIP-51 30002 named set)
- Server lists: Blossom, FileServer
- NIP-51 lists: Follow, Pin, Bookmark, Community, Channel, Room, Feed, Topic,
  Emoji
- Zaps: ZapRequest, ZapReceipt, ZapGoal
- NIP-89 handlers: Handler, HandlerRecommendation
- Rooms/groups (NIP-29): RoomMeta, RoomAdmins, RoomMembers, RoomMembershipOp,
  Room create/delete/join/leave, RoomCreatePermission, RelayMembers,
  RelayMembershipOp, Relay join/leave/invite
- Content: Poll, PollResponse, Thread, Comment, Classified, CalendarEvent,
  Report, Feed, Settings

Also fix unfinished accessors in Profile, method-call bugs in MuteList, and
correct RelayList.set{Read,Write}Relays to preserve a relay's complementary
read/write capability instead of dropping modeless entries.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V67tPYdvh1qCkjEBhJGZUR

packages/domain/src/TopicList.ts

@@ -0,0 +1,27 @@
+import {uniq} from "@welshman/lib"
+import {TOPICS, getTopicTagValues, getAddressTagValues} from "@welshman/util"
+import {EncryptableList} from "./List.js"
+
+// NIP-51 kind-10015 interests/followed-topics list. Followed hashtags are stored
+// as `t` tags; the list may also reference interest sets (kind 30015) via `a`
+// tags. Extends EncryptableList so entries may be public (tags) or private
+// (encrypted content), treated as one merged set by the accessors.
+export class TopicList extends EncryptableList {
+  readonly kind = TOPICS
+
+  topics() {
+    return uniq(getTopicTagValues(this.tags()))
+  }
+
+  addresses() {
+    return uniq(getAddressTagValues(this.tags()))
+  }
+
+  follow(topic: string) {
+    return this.addPublicTags(["t", topic])
+  }
+
+  unfollow(topic: string) {
+    return this.removeTagsWithValue(topic)
+  }
+}