feat(champ): stream champion-spawn state to the sidecar board

Champion spawns have no ServUO EventSink, so add a fourth polled stream
(BridgeChamps) modeled on BridgeSweeps: enumerate every spawn each tick,
fold to a small record, and emit champ.update only on change. No core
patch — every field used is public.

Covers all three families via a `category` field:
  - champion: ChampionSpawn (type/level/kills/boss/cooldown ETA)
  - mini:     MiniChamp (type/level; auto-restarts, no kill counter)
  - sea:      BaseSeaChampion (a High Seas world-boss mobile, alive only
              while summoned; removed via champ.remove when slain)

Status folds to active/cooldown/dormant. A (re)connection clears the diff
cache so the next sweep re-emits the full board, rebuilding a sidecar that
restarted on its own. Transient entries leave via champ.remove.

Sidecar: a `champs` current-state table (one row per serial) fed by
champ.update (upsert) and champ.remove (delete), exposed at GET /champs as
the live board. New ChampSweepSeconds config (default 10s), wired into
[bridge reload/sweepnow/status. Documented in docs/INTEGRATION.md.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0114TpmrNW4wNXsHq5CR72jQ

overlay/Scripts/Custom/Bridge/BridgeConfig.cs

@@ -18,6 +18,7 @@ namespace Server.Custom.Bridge
         public static int DecaySweepSeconds { get; private set; }
         public static int EconomySweepSeconds { get; private set; }
         public static int PageSweepSeconds { get; private set; }
+        public static int ChampSweepSeconds { get; private set; }
 
         public static string LinkUrl { get; private set; }
 
@@ -55,6 +56,10 @@ namespace Server.Custom.Bridge
             if (PageSweepSeconds < 1)
                 PageSweepSeconds = 1;
 
+            ChampSweepSeconds = Config.Get("Bridge.ChampSweepSeconds", 10);
+            if (ChampSweepSeconds < 1)
+                ChampSweepSeconds = 1;
+
             LinkUrl = Config.Get("Bridge.LinkUrl", "https://yoursite/link");
 
             TownCrierMaxLines = Config.Get("Bridge.TownCrierMaxLines", 6);
@@ -90,9 +95,9 @@ namespace Server.Custom.Bridge
         public static string Describe()
         {
             return String.Format(
-                "enabled={0} endpoint={1}:{2} queueCap={3} sweeps(stat={4}s decay={5}s econ={6}s) adminWrite={7}(floor={8})",
+                "enabled={0} endpoint={1}:{2} queueCap={3} sweeps(stat={4}s decay={5}s econ={6}s champ={7}s) adminWrite={8}(floor={9})",
                 Enabled, Host, Port, QueueCap, StatSweepSeconds, DecaySweepSeconds, EconomySweepSeconds,
-                AdminWriteEnabled, AdminAccessFloor);
+                ChampSweepSeconds, AdminWriteEnabled, AdminAccessFloor);
         }
     }
 }