feat(emergency): searchExpert接口返回ConDoctor专家数据 + 修复IM UserSig缓存key未区分secretKey的问题

1. searchExpert新增ConDoctor专家字段:
   - 新增ConDoctorMapper直接查询qh_con_doctor表(同库,避免跨模块依赖)
   - EmergencyProfessionUser新增17个@TableField(exist=false)字段承载专家数据
   - searchExpert方法中批量查询ConDoctor并逐字段填充
   - 用户非专家时ConDoctor字段为null
   - 更新API文档-移动端接口.md

2. IM签名缓存优化:
   - TencentCloudImUtil新增secretKey注入
   - Redis key从 silence:im_user_sig:{sdkAppId}:{id}
     改为 silence:im_user_sig:{hash(sdkAppId+secretKey)}:{id}
   - 解决secretKey变更时旧缓存签名仍被命中导致IM请求失败的问题

Co-Authored-By: Claude <noreply@anthropic.com>

health-emergency/health-emergency-api/src/main/java/com/renkang/emergency/entity/EmergencyProfessionUser.java

@@ -134,4 +134,62 @@ public class EmergencyProfessionUser implements Serializable {
     // 手机号（非持久字段，查询时填充）
     @TableField(exist = false)
     private String phone;
+
+    // ===== 以下字段来源于 qh_con_doctor（咨询服务医生表），查询时批量填充 =====
+    // 医生姓名
+    @TableField(exist = false)
+    private String doctorName;
+    // 专家编号
+    @TableField(exist = false)
+    private String doctorNo;
+    // 医生头像
+    @TableField(exist = false)
+    private String photo;
+    // 医院名称
+    @TableField(exist = false)
+    private String resourceName;
+    // 科室id
+    @TableField(exist = false)
+    private String departmentId;
+    // 科室名称
+    @TableField(exist = false)
+    private String departmentName;
+    // 职务
+    @TableField(exist = false)
+    @Dict(dicCode = "z_doct_lev")
+    private String doctorTitle;
+    // 职称
+    @TableField(exist = false)
+    @Dict(dicCode = "z_doct_job")
+    private String doctorJob;
+    // 专家状态
+    @TableField(exist = false)
+    @Dict(dicCode = "doc_status")
+    private String doctorStatus;
+    // 是否开启咨询(1开启 3关闭)
+    @TableField(exist = false)
+    @Dict(dicCode = "z_doct_sta")
+    private String isAccept;
+    // 专家类型(z_doct_typ) —— 避免与人员type冲突，命名为doctorType
+    @TableField(exist = false)
+    @Dict(dicCode = "z_doct_typ")
+    private String doctorType;
+    // 是否提供音视频
+    @TableField(exist = false)
+    private String audioStatus;
+    // 是否跳过节假日
+    @TableField(exist = false)
+    private String tfJumpHoliday;
+    // 执业经历
+    @TableField(exist = false)
+    private String experience;
+    // 排序
+    @TableField(exist = false)
+    private Integer sort;
+    // 是否推荐(0否1是)
+    @TableField(exist = false)
+    private String tfRecommend;
+    // 简介
+    @TableField(exist = false)
+    private String introduction;
 }