feat: Add new strategic actions for nation turns

- Implemented '백성동원' (Mobilize People) action to enhance city defense and gain experience for generals.
- Added '수몰' (Flood) action to damage enemy city defenses and affect diplomatic relations.
- Created '이호경식' (Degrade Relations) action to manipulate diplomatic states between nations.
- Introduced '필사즉생' (Desperate Fight) action to boost training and atmosphere for generals in a nation.
- Developed '허보' (Deception) action to mislead enemy generals and alter their city assignments.

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

@@ -351,6 +351,8 @@ class WorldStateView implements StateView {
                     req.srcNationId,
                     req.destNationId
                 );
+            case 'diplomacyList':
+                return this.world.listDiplomacy();
             case 'arg':
                 return this.args[req.key] ?? null;
             case 'env':