Add CObjectIndex lookups over the cache templates

Built at login and world bootstrap after the three parsers load (Task 0.1):
- lookup(id) across ITEM, then DEED, then RUNE
- race (MonsterType) -> creation race rune ids, male and female
- ClassType -> class rune id, DisciplineType -> discipline rune id
- SBStringHash(rune_sub_type) token -> runes
- skill and power name <-> SBStringHash token, from every template field
  that names one

No consumers yet; no values change.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/engine/server/login/LoginServer.java

@@ -21,6 +21,7 @@ import engine.net.client.ClientConnection;
 import engine.net.client.ClientConnectionManager;
 import engine.net.client.msg.login.*;
 import engine.objects.*;
+import engine.parsers.cache.CObjectIndex;
 import engine.parsers.cache.DeedParser;
 import engine.parsers.cache.ItemParser;
 import engine.parsers.cache.RuneParser;
@@ -314,6 +315,9 @@ public class LoginServer {
             exit(1);
         }
 
+        Logger.info("Indexing Cache Templates");
+        CObjectIndex.build();
+
         Logger.info("Initializing Network");
         Network.init();