feat: 实现员工同步任务的WebSocket支持及合同名称锁定功能

- 为EmployeesSyncTask添加WebSocket客户端和服务端支持，实现实时任务进度反馈
- 新增合同名称锁定功能，防止误修改重要合同名称
- 优化SmbFileService的连接异常处理，提高稳定性
- 重构ContractFilesRebuildTasker的任务执行逻辑，改进错误处理
- 更新tasker_mapper.json注册EmployeesSyncTask
- 添加相关任务文档和验收报告

修复WebSocketClientSession的任务完成状态处理问题
改进UITools中任务执行的线程管理
优化DepartmentService的findByCode方法返回类型

server/src/main/java/com/ecep/contract/service/SmbFileService.java

@@ -15,7 +15,6 @@ import com.hierynomus.smbj.SMBClient;
 import com.hierynomus.smbj.auth.AuthenticationContext;
 import com.hierynomus.smbj.common.SMBRuntimeException;
 import com.hierynomus.smbj.common.SmbPath;
-import com.hierynomus.smbj.event.SessionLoggedOff;
 import com.hierynomus.smbj.share.DiskShare;
 import com.hierynomus.smbj.share.File;
 import lombok.extern.slf4j.Slf4j;
@@ -25,6 +24,7 @@ import org.springframework.stereotype.Service;
 
 import java.io.IOException;
 import java.io.OutputStream;
+import java.net.SocketException;
 import java.util.*;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ScheduledExecutorService;
@@ -271,6 +271,7 @@ public class SmbFileService implements DisposableBean {
                     // 更新连接的最后使用时间
                     connectionInfo.updateLastUsedTimestamp();
                     log.debug("Reusing SMB connection for host: {}", hostname);
+
                     return connectionInfo;
                 }
                 log.debug("Closing invalid SMB connection for host: {}", hostname);
@@ -289,7 +290,6 @@ public class SmbFileService implements DisposableBean {
             } finally {
                 connectionPoolLock.unlock();
             }
-
         }
         return null;
     }
@@ -305,6 +305,27 @@ public class SmbFileService implements DisposableBean {
         return getConnectionInfo(hostname).getConnection();
     }
 
+    /**
+     * 判断异常是否为连接相关异常
+     *
+     * @param e 异常
+     * @return 如果是连接相关异常返回true，否则返回false
+     */
+    private boolean isConnectionException(Exception e) {
+        if (e instanceof SMBRuntimeException) {
+            Throwable cause = e.getCause();
+            while (cause != null) {
+                if (cause instanceof TransportException || cause instanceof SocketException) {
+                    return true;
+                }
+                cause = cause.getCause();
+            }
+        } else if (e instanceof IOException) {
+            return e instanceof SocketException || e.getMessage().contains("连接");
+        }
+        return false;
+    }
+
     // Session空闲超时时间：2分钟（比连接超时时间短）
     private static final long SESSION_IDLE_TIMEOUT_MS = 2 * 60 * 1000;
 
@@ -416,6 +437,15 @@ public class SmbFileService implements DisposableBean {
                         log.debug("Created new SMB session for host: {}", hostname);
                     } catch (SMBRuntimeException ex) {
                         log.error("Failed to create SMB session for host: {}, maxTrys:{}", hostname, maxTrys, ex);
+                        // 检查是否是连接问题，如果是则从池中移除连接
+                        if (isConnectionException(ex)) {
+                            connectionPoolLock.lock();
+                            try {
+                                connectionPool.remove(hostname);
+                            } finally {
+                                connectionPoolLock.unlock();
+                            }
+                        }
                         continue;
                     }
                 } else {
@@ -435,6 +465,10 @@ public class SmbFileService implements DisposableBean {
                     } catch (IOException ignored) {
                     }
                     log.error("Failed to execute SMB operation for host: {}, maxTrys:{}", hostname, maxTrys, e);
+                    // 检查是否是连接问题，如果是则从池中移除连接
+                    if (isConnectionException(e)) {
+                        connectionPool.remove(hostname);
+                    }
                     continue;
                 } finally {
 
@@ -451,6 +485,11 @@ public class SmbFileService implements DisposableBean {
                         log.debug("Removed disconnected SMB connection from pool for host: {}", hostname);
                     }
                 }
+                // 如果是连接异常且还有重试次数，继续重试
+                if (isConnectionException(e) && maxTrys > 0) {
+                    log.debug("Retrying SMB operation due to connection exception, remaining tries: {}", maxTrys);
+                    continue;
+                }
                 throw e;
             }
         }