refactor(databus): 移除API客户端凭证服务中的缓存实现

- 删除了基于Caffeine的凭证缓存逻辑
- 移除了PostConstruct注解的缓存初始化方法
- 删除了缓存相关的成员变量和配置
- 移除了所有缓存失效操作包括创建、更新和删除时的缓存清理
- 简化了凭证查询逻辑直接通过数据库访问
- 保留了核心的API凭证管理功能和匿名用户服务集成

zt-module-databus/zt-module-databus-server/src/main/java/com/zt/plat/module/databus/service/gateway/impl/ApiClientCredentialServiceImpl.java

@@ -1,7 +1,5 @@
 package com.zt.plat.module.databus.service.gateway.impl;
 
-import com.github.benmanes.caffeine.cache.Caffeine;
-import com.github.benmanes.caffeine.cache.LoadingCache;
 import com.zt.plat.framework.common.exception.util.ServiceExceptionUtil;
 import com.zt.plat.framework.common.pojo.PageResult;
 import com.zt.plat.framework.common.util.object.BeanUtils;
@@ -11,14 +9,12 @@ import com.zt.plat.module.databus.dal.dataobject.gateway.ApiClientCredentialDO;
 import com.zt.plat.module.databus.dal.mysql.gateway.ApiClientCredentialMapper;
 import com.zt.plat.module.databus.service.gateway.ApiAnonymousUserService;
 import com.zt.plat.module.databus.service.gateway.ApiClientCredentialService;
-import jakarta.annotation.PostConstruct;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 import org.springframework.util.StringUtils;
 
-import java.time.Duration;
 import java.util.List;
 import java.util.Objects;
 import java.util.Optional;
@@ -36,16 +32,6 @@ public class ApiClientCredentialServiceImpl implements ApiClientCredentialServic
     private final ApiClientCredentialMapper credentialMapper;
     private final ApiAnonymousUserService anonymousUserService;
 
-    private LoadingCache<String, Optional<ApiClientCredentialDO>> credentialCache;
-
-    @PostConstruct
-    public void initCache() {
-        credentialCache = Caffeine.newBuilder()
-                .maximumSize(256)
-                .expireAfterWrite(Duration.ofMinutes(5))
-                .build(this::loadCredentialSync);
-    }
-
     @Override
     public PageResult<ApiClientCredentialDO> getPage(ApiClientCredentialPageReqVO reqVO) {
         return credentialMapper.selectPage(reqVO);
@@ -67,7 +53,6 @@ public class ApiClientCredentialServiceImpl implements ApiClientCredentialServic
             credential.setAnonymousUserId(null);
         }
         credentialMapper.insert(credential);
-        invalidateCache(credential.getAppId());
         return credential.getId();
     }
 
@@ -86,8 +71,6 @@ public class ApiClientCredentialServiceImpl implements ApiClientCredentialServic
             updateObj.setAnonymousUserId(null);
         }
         credentialMapper.updateById(updateObj);
-        invalidateCache(existing.getAppId());
-        invalidateCache(updateObj.getAppId());
         if (!Objects.equals(existing.getAnonymousUserId(), updateObj.getAnonymousUserId())) {
             anonymousUserService.invalidate(existing.getAnonymousUserId());
             anonymousUserService.invalidate(updateObj.getAnonymousUserId());
@@ -99,7 +82,6 @@ public class ApiClientCredentialServiceImpl implements ApiClientCredentialServic
     public void delete(Long id) {
         ApiClientCredentialDO existing = ensureExists(id);
         credentialMapper.deleteById(id);
-        invalidateCache(existing.getAppId());
         anonymousUserService.invalidate(existing.getAnonymousUserId());
     }
 
@@ -118,11 +100,7 @@ public class ApiClientCredentialServiceImpl implements ApiClientCredentialServic
         if (!StringUtils.hasText(appId)) {
             return Optional.empty();
         }
-        return credentialCache.get(appId.trim());
+        Optional<ApiClientCredentialDO> credential = credentialMapper.selectByAppId(appId.trim())
-    }
-
-    private Optional<ApiClientCredentialDO> loadCredentialSync(String appId) {
-        Optional<ApiClientCredentialDO> credential = credentialMapper.selectByAppId(appId)
                 .filter(item -> Boolean.TRUE.equals(item.getEnabled()));
         if (credential.isEmpty()) {
             log.debug("[API-PORTAL] 未找到 appId={} 的有效凭证", appId);
@@ -147,13 +125,6 @@ public class ApiClientCredentialServiceImpl implements ApiClientCredentialServic
         return credential;
     }
 
-    private void invalidateCache(String appId) {
-        if (!StringUtils.hasText(appId)) {
-            return;
-        }
-        credentialCache.invalidate(appId.trim());
-    }
-
     private void normalizeAnonymousSettings(ApiClientCredentialSaveReqVO reqVO) {
         if (Boolean.TRUE.equals(reqVO.getAllowAnonymous())) {
             if (reqVO.getAnonymousUserId() == null) {