Load BaseClass from the class runes instead of static_rune_baseclass

LoadAllBaseClasses builds one BaseClass per CLASS rune with
rune_is_standard_character_creation (2500-2503; promotions and Pet are
skipped) and caches it. Race.baseClasses picks up the cached objects through
GET_BASECLASS_FOR_RACE. The SQL loader stays until task 2.11.

Value changes: description goes from '' to the rune_dsc class blurb (unread).
All other fields unchanged; final parity before the switch (scripts/p21.py):
4 rows, 0 differences in name, attribute mods, token, health/mana/stamina mods.
The static_rune_baseclass comparator is removed; it would only compare the
JSON with itself now.

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

src/engine/objects/BaseClass.java

@@ -14,6 +14,7 @@ import engine.mbEnums;
 import engine.net.ByteBufferWriter;
 import engine.parsers.objects.RuneTemplate;
 import engine.util.Hasher;
+import org.pmw.tinylog.Logger;
 
 import java.sql.ResultSet;
 import java.sql.SQLException;
@@ -130,7 +131,19 @@ public class BaseClass extends AbstractGameObject {
     }
 
     public static void LoadAllBaseClasses() {
-        DbManager.BaseClassQueries.GET_ALL_BASE_CLASSES();
+
+        int loadedCount = 0;
+
+        // Promotion classes and the Pet class are also CLASS runes, but not standard creation runes
+        for (RuneTemplate rune : RuneTemplate._runes.values()) {
+            if (rune.rune_type != mbEnums.RuneType.CLASS || !rune.rune_is_standard_character_creation)
+                continue;
+
+            DbManager.addToCache(new BaseClass(rune));
+            loadedCount++;
+        }
+
+        Logger.info("Loaded " + loadedCount + " base classes from runes");
     }
 
     public static void serializeForClientMsg(BaseClass baseClass, ByteBufferWriter writer) {