feat(admin): show moves and hints used on the user card

The admin user-detail stats panel listed wins/losses/draws/best game/best move
but not the two new lifetime counters. Surface them as raw operator-facing
numbers (Moves, Hints used) next to the rest.

Audit follow-up (no code needed elsewhere): the load-test harness uses the
shared pkg/fbs codec and only checks result codes / reads a StateView subset, so
the trailing StatsView/StateView/HintResult fields are backward-compatible there;
the game-detail per-seat "hints used" already reflects the true total via the
repurposed counter.

backend/internal/adminconsole/templates/pages/user_detail.gohtml

@@ -32,6 +32,8 @@
 <li><b>Wins</b> {{.Stats.Wins}}</li>
 <li><b>Losses</b> {{.Stats.Losses}}</li>
 <li><b>Draws</b> {{.Stats.Draws}}</li>
+<li><b>Moves</b> {{.Stats.Moves}}</li>
+<li><b>Hints used</b> {{.Stats.HintsUsed}}</li>
 <li><b>Best game</b> {{.Stats.MaxGamePoints}}</li>
 <li><b>Best move</b> {{.Stats.MaxWordPoints}}</li>
 </ul>

backend/internal/adminconsole/views.go

@@ -203,6 +203,8 @@ type StatsRow struct {
 	Draws         int
 	MaxGamePoints int
 	MaxWordPoints int
+	Moves         int
+	HintsUsed     int
 }
 
 // IdentityRow is one platform/email identity of an account.