feat(security): creado componente CustomAuthenticationEntryPoint

src/main/java/com/example/apprecetas/security/config/CustomAuthenticationEntryPoint.java

+package com.example.apprecetas.security.config;
+
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import org.springframework.security.core.AuthenticationException;
+import org.springframework.security.web.AuthenticationEntryPoint;
+import org.springframework.stereotype.Component;
+
+import java.io.IOException;
+
+@Component
+public class CustomAuthenticationEntryPoint implements AuthenticationEntryPoint {
+
+    @Override
+    public void commence(HttpServletRequest request, HttpServletResponse response, AuthenticationException authException) throws IOException, ServletException {
+        response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Error: No autorizado");
+    }
+}