Initial commit: Full project structure

- Backend: NestJS with Docker
- Frontend: Next.js with Docker
- Nginx configuration for reverse proxy
- PostgreSQL setup
- Docker compose for orchestration
- Development environment configuration

backend/src/modules/auth/interfaces/jwt-payload.interface.ts

@@ -0,0 +1,7 @@
+// backend/src/modules/auth/interfaces/jwt-payload.interface.ts
+export interface JwtPayload {
+  sub: string; // user id
+  email: string;
+  type?: 'access' | 'refresh';
+}
+