feat(daemon): publish room member statistics over RPC and the CLI

The statistics parsed from the JoinRoom reply were reachable only from the
library. They answer the question `room users` already exists to ask -- who
is in here, and are they worth downloading from -- so they belong on its
output rather than behind a second call.

- proto: room.member_stats, with a RoomUserStatsDto carrying status, share
  counts, free slots and country
- SessionApi::room_member_stats, so local and remote sessions stay
  interchangeable; the status word is decoded through one shared helper
  rather than a third copy of the match
- `room users` now emits status, average_speed, shared_files,
  shared_folders, slots_free and country, each null when the server said
  nothing, documented in SKILL.md
- docs/openrpc.json regenerated from the wire types

soulseek-rs/src/output.rs

@@ -370,16 +370,33 @@ impl Record for UserRecord {
     }
 }
 
-/// One member of a chat room.
+/// One member of a chat room, with the server's description of them.
+///
+/// The statistics come from the reply that named the members, and are `None`
+/// for a server that sent none — so a consumer never reads "shares nothing"
+/// from a missing answer.
 #[derive(Debug, Clone, PartialEq, Eq, Serialize)]
 pub struct RoomMemberRecord {
     pub room: String,
     pub user: String,
+    /// `online`, `away`, or `offline`.
+    pub status: Option<String>,
+    pub average_speed: Option<u32>,
+    pub shared_files: Option<u32>,
+    pub shared_folders: Option<u32>,
+    pub slots_free: Option<u32>,
+    pub country: Option<String>,
 }
 
 impl Record for RoomMemberRecord {
     fn text(&self) -> String {
-        sanitize(&self.user)
+        let unknown = || "-".to_string();
+        format!(
+            "{}\t{}\t{}",
+            sanitize(&self.user),
+            self.status.clone().unwrap_or_else(unknown),
+            self.shared_files.map_or_else(unknown, |v| v.to_string())
+        )
     }
 }