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/MessagingRelayList.ts

@@ -0,0 +1,30 @@
+import {uniqBy} from "@welshman/lib"
+import {MESSAGING_RELAYS, getTagValues, normalizeRelayUrl} from "@welshman/util"
+import {EncryptableList} from "./List.js"
+
+// NIP-17 kind-10050 messaging/inbox relays. Entries are marker-less
+// ['relay', url] tags (NOT NIP-65 'r' tags with read/write markers, and the
+// RelayMode.Messaging marker is not used per-tag here). `urls()` drives where
+// encrypted DM gift-wraps are sent and fetched, so it stays a flat, normalized
+// set. Identical structure to BlockedRelayList/SearchRelayList.
+export class MessagingRelayList extends EncryptableList {
+  readonly kind = MESSAGING_RELAYS
+
+  urls() {
+    return uniqBy(normalizeRelayUrl, getTagValues("relay", this.tags()))
+  }
+
+  addRelay(url: string) {
+    return this.addPublicTags(["relay", normalizeRelayUrl(url)])
+  }
+
+  removeRelay(url: string) {
+    return this.removeTagsWithValue(url)
+  }
+
+  setRelays(urls: string[]) {
+    this.keepTagsWithKey("relay")
+
+    return this.addPublicTags(...urls.map(url => ["relay", normalizeRelayUrl(url)]))
+  }
+}