Feat: Add splash layer (#29)

Add splash layer, support game start, settings, exit
Modify settings layer, add "go back to splash" and "exit"
Add character threshold for history input
Closes #28

web/src/api/modules/system.ts

@@ -45,5 +45,13 @@ export const systemApi = {
 
   startGame(config: GameStartConfigDTO) {
     return httpClient.post<{ status: string; message: string }>('/api/game/start', config);
+  },
+
+  shutdown() {
+    return httpClient.post<{ status: string; message: string }>('/api/control/shutdown', {});
+  },
+
+  resetGame() {
+    return httpClient.post<{ status: string; message: string }>('/api/control/reset', {});
   }
 };