feat: add GeneralTurn and NationTurn models with CRUD operations

- Introduced GeneralTurn and NationTurn models in Prisma schema.
- Implemented reserved turns management in the game API, including loading, setting, and shifting turns for generals and nations.
- Created unit tests for reserved turns functionality to ensure correctness.
- Developed reserved turn handler to process actions based on reserved turns.
- Established in-memory storage for reserved turns with persistence to the database.

app/game-api/test/router.test.ts

@@ -28,6 +28,16 @@ const buildContext = (options?: {
         nation: {
             findUnique: async () => null,
         },
+        generalTurn: {
+            findMany: async () => [],
+            deleteMany: async () => ({}),
+            createMany: async () => ({}),
+        },
+        nationTurn: {
+            findMany: async () => [],
+            deleteMany: async () => ({}),
+            createMany: async () => ({}),
+        },
     };
     return {
         db,