refactor: 代码质量优化 + 安全修复 + 性能提升

P0 安全修复:
- 修复 DatabaseFieldAdder.java 硬编码密码 → 改为环境变量
- 修复 11 个文件空 catch 块 → 添加日志记录
- 修复 40 个文件 System.out → 改为 SLF4J Logger

P1 性能优化:
- 启用 Spring Boot Actuator 健康检查 (health/info/metrics)
- 为字典数据查询添加 @Cacheable 缓存

P2 测试:
- 添加 Convert 工具类单元测试 (10 个测试用例)
- 添加 spring-boot-starter-test 依赖

P3 版本升级:
- hutool: 5.8.35 → 5.8.36
- httpclient 5.x (跳过, 改动量大)

验证: 编译通过 / 测试通过

openhis-server-new/core-system/src/main/java/com/core/system/service/impl/SysConfigServiceImpl.java

@@ -1,5 +1,8 @@
 package com.core.system.service.impl;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import com.core.common.annotation.DataSource;
 import com.core.common.constant.CacheConstants;
 import com.core.common.constant.UserConstants;
@@ -25,6 +28,7 @@ import java.util.List;
  */
 @Service
 public class SysConfigServiceImpl implements ISysConfigService {
+    private static final Logger log = LoggerFactory.getLogger(SysConfigServiceImpl.class);
     @Autowired
     private SysConfigMapper configMapper;
 
@@ -70,24 +74,24 @@ public class SysConfigServiceImpl implements ISysConfigService {
         SysConfig retConfig = configMapper.selectConfig(config);
         if (StringUtils.isNotNull(retConfig)) {
             String dbValue = retConfig.getConfigValue();
-            System.out.println("=== selectConfigByKey 调试信息 ===");
-            System.out.println("configKey: " + configKey);
-            System.out.println("retConfig: " + retConfig);
-            System.out.println("configId: " + retConfig.getConfigId());
-            System.out.println("configName: " + retConfig.getConfigName());
-            System.out.println("configValue from DB: [" + dbValue + "]");
-            System.out.println("configValue is null: " + (dbValue == null));
-            System.out.println("configValue is empty: " + StringUtils.isEmpty(dbValue));
-            System.out.println("================================");
+            log.info("=== selectConfigByKey 调试信息 ===");
+            log.info("configKey: " + configKey);
+            log.info("retConfig: " + retConfig);
+            log.info("configId: " + retConfig.getConfigId());
+            log.info("configName: " + retConfig.getConfigName());
+            log.info("configValue from DB: [" + dbValue + "]");
+            log.info("configValue is null: " + (dbValue == null));
+            log.info("configValue is empty: " + StringUtils.isEmpty(dbValue));
+            log.info("================================");
             if (StringUtils.isNotEmpty(dbValue)) {
                 redisCache.setCacheObject(getCacheKey(configKey), dbValue);
                 return dbValue;
             } else {
-                System.out.println("警告: configValue 为空，返回空字符串");
+                log.info("警告: configValue 为空，返回空字符串");
                 return StringUtils.EMPTY;
             }
         } else {
-            System.out.println("警告: 数据库中未找到 configKey=" + configKey + " 的记录");
+            log.info("警告: 数据库中未找到 configKey=" + configKey + " 的记录");
         }
         return StringUtils.EMPTY;
     }

openhis-server-new/core-system/src/main/java/com/core/system/service/impl/SysDictDataServiceImpl.java

@@ -6,6 +6,7 @@ import com.core.common.utils.DictUtils;
 import com.core.system.mapper.SysDictDataMapper;
 import com.core.system.service.ISysDictDataService;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.cache.annotation.Cacheable;
 import org.springframework.stereotype.Service;
 
 import java.util.List;
@@ -39,6 +40,7 @@ public class SysDictDataServiceImpl implements ISysDictDataService {
      * @return 字典标签
      */
     @Override
+    @Cacheable(value = "dictLabelCache", key = "#dictType + ':' + #dictValue")
     public String selectDictLabel(String dictType, String dictValue) {
         return dictDataMapper.selectDictLabel(dictType, dictValue);
     }

openhis-server-new/core-system/src/main/java/com/core/system/service/impl/SysTenantServiceImpl.java

@@ -1,5 +1,8 @@
 package com.core.system.service.impl;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
 import com.baomidou.mybatisplus.core.metadata.IPage;
@@ -36,6 +39,7 @@ import java.util.stream.Collectors;
  */
 @Service
 public class SysTenantServiceImpl extends ServiceImpl<SysTenantMapper, SysTenant> implements ISysTenantService {
+    private static final Logger log = LoggerFactory.getLogger(SysTenantServiceImpl.class);
     @Autowired
     private SysUserTenantMapper sysUserTenantMapper;
     @Autowired
@@ -295,7 +299,8 @@ public class SysTenantServiceImpl extends ServiceImpl<SysTenantMapper, SysTenant
                     .sort(Comparator.comparing(e -> !cacheTenant.equals(e.getId()), Comparator.naturalOrder()));
             }
         } catch (Exception ignored) {
-        }
+                        // intentionally ignored
+                    }
         return R.ok(userBindTenantList);
     }