新增：数据源预热；加密配置解密优化

common/src/main/java/com/sdm/common/config/DataSourcePreWarmer.java

@@ -0,0 +1,47 @@
+package com.sdm.common.config;//package com.sdm.project.config.mybatis;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.ApplicationRunner;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import javax.sql.DataSource;
+import java.sql.Connection;
+
+@Slf4j
+@Configuration
+public class DataSourcePreWarmer {
+
+    @Bean
+    public ApplicationRunner secondDataSourcePreWarmer(
+            @Qualifier("secondDataSource") DataSource secondDataSource) {
+        return args -> {
+            try (Connection conn = secondDataSource.getConnection()) {
+                log.info("✅ secondDataSource 预热成功，连接已建立: {}", conn);
+            } catch (Exception e) {
+                log.error("❌ secondDataSource 预热失败", e);
+                throw new RuntimeException(e);
+            }
+        };
+    }
+
+    @Bean
+    public ApplicationRunner mainDataSourcePreWarmer(
+            @Qualifier("masterDataSource") DataSource master,
+            @Qualifier("slaveDataSource") DataSource slave) {
+        return args -> {
+            try {
+                try (Connection c1 = master.getConnection()) {
+                    log.info("✅ masterDataSource 预热成功: {}", c1);
+                }
+                try (Connection c2 = slave.getConnection()) {
+                    log.info("✅ slaveDataSource 预热成功: {}", c2);
+                }
+            } catch (Exception e) {
+                log.error("❌ 主从数据源预热失败", e);
+                throw new RuntimeException(e);
+            }
+        };
+    }
+}