feat: add expo mobile application source code

mobile/utils/logger.ts

@@ -0,0 +1,34 @@
+import { ApiService } from '../services/api';
+
+class Logger {
+  private logs: string[] = [];
+  private maxLogs = 50;
+
+  log(message: string, type: 'info' | 'error' | 'sync' | 'success' = 'info') {
+    const timestamp = new Date().toLocaleTimeString();
+    const entry = `[${timestamp}] [${type.toUpperCase()}] ${message}`;
+    this.logs.unshift(entry);
+    
+    if (this.logs.length > this.maxLogs) {
+      this.logs.pop();
+    }
+    
+    if (type === 'error') {
+      ApiService.reportError(message, 'error').catch(() => {});
+    }
+
+    if (__DEV__) {
+      console.log(entry);
+    }
+  }
+
+  getLogs() {
+    return this.logs;
+  }
+
+  clear() {
+    this.logs = [];
+  }
+}
+
+export const DebugLogger = new Logger();