fix(teams): say "game server", not "shard", on the never-synced Teams panel

Admin → Teams told an operator that an unsynced projection "is not a
confirmed empty shard". Teams is a core primitive and core's word for the
host is the game server; "shard" is Ultima Online's. The detail now reads
"What is shown below does not confirm that the game server has no Teams."

The matching test, and the four comments that said "shard" about the same
state, follow it. Found while making runicgateway.com's core docs
game-neutral (runicgateway.com#34), which had to paraphrase this line
rather than quote it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

server/src/model/teams/teams.model.js

@@ -135,7 +135,7 @@ async function syncStatus() {
     configured: true,
     lastSyncAt,
     // Never synced at all is stale: a page must not present an empty projection
-    // as a confirmed empty shard.
+    // as a confirmed empty one.
     stale: ageS > intervalS * STALE_INTERVALS,
     consecutiveFailures: state ? state.consecutive_failures : 0,
   }