feat: add Podman compatibility with non-privileged ports

- Change Docker ports from 80/8000 to 8081/8080 (non-privileged)
- Update CORS_ORIGINS in docker-compose.yml and .env.docker
- Update all documentation (README.md, DOCKER.md) with new ports
- Add Podman compatibility section to CHANGELOG.md
- Enable podman-compose usage without root privileges

docker-compose.yml

@@ -9,11 +9,11 @@ services:
     container_name: notytex-backend
     restart: unless-stopped
     ports:
-      - "8000:8000"
+      - "8080:8000"
     environment:
       - DATABASE_URL=sqlite+aiosqlite:////data/school_management.db
       - SECRET_KEY=${SECRET_KEY:-change-me-in-production-min-32-chars}
-      - CORS_ORIGINS=["http://localhost","http://localhost:80","http://localhost:3000"]
+      - CORS_ORIGINS=["http://localhost:8081","http://localhost:8080","http://localhost:3000"]
       - LOG_LEVEL=INFO
     volumes:
       - ./data:/data
@@ -35,7 +35,7 @@ services:
     container_name: notytex-frontend
     restart: unless-stopped
     ports:
-      - "80:80"
+      - "8081:80"
     depends_on:
       - backend
     networks: