Refactor code structure for improved readability and maintainability

backend/dist/auth/jwt.strategy.d.ts

@@ -0,0 +1,21 @@
+import { Strategy } from 'passport-jwt';
+declare const JwtStrategy_base: new (...args: any[]) => Strategy;
+export declare class JwtStrategy extends JwtStrategy_base {
+    private readonly logger;
+    constructor();
+    validate(payload: {
+        sub?: number;
+        id?: number;
+        userId?: number;
+        username?: string;
+        role?: string;
+        isPremium?: boolean;
+    }): Promise<{
+        id: number | undefined;
+        userId: number | undefined;
+        username: string | undefined;
+        role: string;
+        isPremium: boolean;
+    }>;
+}
+export {};