feat: add new general actions for border return, gifting, disbanding, founding nations, and fierce training

- Implemented '접경귀환' action for returning to a home city within 3 spaces.
- Added '증여' action for transferring resources between generals with constraints.
- Created '해산' action to disband a faction, resetting generals and cities.
- Developed '건국' action for founding a new nation with specified attributes.
- Introduced '맹훈련' action for training generals, enhancing their stats.
- Added tests for the new actions to ensure functionality and constraints are respected.

app/game-engine/src/turn/reservedTurnHandler.ts

@@ -64,6 +64,13 @@ const resolveConstraintEnv = (
     const relYear = typeof startYear === 'number' ? world.currentYear - startYear : undefined;
     const joinModeRaw = worldMeta.join_mode ?? worldMeta.joinMode;
     const joinMode = joinModeRaw === 'onlyRandom' ? 'onlyRandom' : 'full';
+    const killturnRaw = worldMeta.killturn;
+    const killturn =
+        typeof killturnRaw === 'number'
+            ? killturnRaw
+            : typeof killturnRaw === 'string'
+              ? Number(killturnRaw)
+              : undefined;
 
     return {
         ...env,
@@ -76,6 +83,7 @@ const resolveConstraintEnv = (
         openingPartYear: env.openingPartYear,
         minAvailableRecruitPop: env.minAvailableRecruitPop,
         join_mode: joinMode,
+        ...(Number.isFinite(killturn) ? { killturn } : {}),
     };
 };