perf: 收敛后端资源与健康检查开销

- 缩小模块扫描范围并显式注册各业务模块自动配置

- 增加可配置线程池、MQ 连接池与消费线程池，降低默认资源占用

- 将 RAG 与分析库中间件探活下沉到健康检查并增加短缓存

- 补齐文档向量库生命周期释放与 SSE 断连清理

easyflow-modules/easyflow-module-ai/src/test/java/tech/easyflow/ai/config/CachedHealthIndicatorSupportTest.java

@@ -0,0 +1,93 @@
+package tech.easyflow.ai.config;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.springframework.boot.actuate.health.Health;
+
+import java.time.Clock;
+import java.time.Duration;
+import java.time.Instant;
+import java.time.ZoneId;
+import java.util.concurrent.atomic.AtomicInteger;
+
+/**
+ * 健康检查短缓存测试。
+ */
+public class CachedHealthIndicatorSupportTest {
+
+    /**
+     * 验证 TTL 内重复健康检查复用缓存。
+     */
+    @Test
+    public void shouldReuseHealthWithinCacheTtl() {
+        RagHealthProperties properties = new RagHealthProperties();
+        properties.setCacheTtl(Duration.ofSeconds(5));
+        MutableClock clock = new MutableClock();
+        CountingHealthIndicator indicator = new CountingHealthIndicator(properties, clock);
+
+        indicator.cachedHealth();
+        indicator.cachedHealth();
+
+        Assert.assertEquals(1, indicator.count());
+    }
+
+    /**
+     * 验证 TTL 过期后重新执行健康检查。
+     */
+    @Test
+    public void shouldRefreshHealthAfterCacheExpired() {
+        RagHealthProperties properties = new RagHealthProperties();
+        properties.setCacheTtl(Duration.ofSeconds(5));
+        MutableClock clock = new MutableClock();
+        CountingHealthIndicator indicator = new CountingHealthIndicator(properties, clock);
+
+        indicator.cachedHealth();
+        clock.plus(Duration.ofSeconds(6));
+        indicator.cachedHealth();
+
+        Assert.assertEquals(2, indicator.count());
+    }
+
+    private static class CountingHealthIndicator extends CachedHealthIndicatorSupport {
+
+        private final AtomicInteger counter = new AtomicInteger();
+
+        private CountingHealthIndicator(RagHealthProperties properties, Clock clock) {
+            super(properties, clock);
+        }
+
+        @Override
+        protected Health doHealthCheck() {
+            counter.incrementAndGet();
+            return Health.up().build();
+        }
+
+        private int count() {
+            return counter.get();
+        }
+    }
+
+    private static class MutableClock extends Clock {
+
+        private Instant instant = Instant.parse("2026-05-25T00:00:00Z");
+
+        @Override
+        public ZoneId getZone() {
+            return ZoneId.of("UTC");
+        }
+
+        @Override
+        public Clock withZone(ZoneId zone) {
+            return this;
+        }
+
+        @Override
+        public Instant instant() {
+            return instant;
+        }
+
+        private void plus(Duration duration) {
+            instant = instant.plus(duration);
+        }
+    }
+}