feat: 接入 Prometheus 监控（放行 /actuator/prometheus + 指标暴露 + compose 编排）

fruitshorts-framework/src/main/java/com/fruitshorts/framework/security/SecurityConfig.java

@@ -53,9 +53,10 @@ public class SecurityConfig {
             "/swagger-ui/**",
             "/swagger-ui.html",
             "/v3/api-docs/**",
-            /* 健康检查：给容器编排与冒烟脚本用（本项目没引 actuator，见 HealthController 注释） */
+            /* 健康检查与监控：/actuator/health 给容器编排，/actuator/prometheus 给 Prometheus 抓取指标 */
             "/healthz",
-            "/actuator/health"
+            "/actuator/health",
+            "/actuator/prometheus"
     };
 
     private final JwtAuthenticationFilter jwtAuthenticationFilter;