feat: 员工信息管理功能完善

- 将员工表org_no字段迁移至dept_id，关联系统部门表
- 更新员工信息相关DTO、VO和Controller，使用deptId替代orgNo
- 添加员工信息管理OpenSpec规范文档(proposal/design/spec/tasks)
- 更新API文档，反映部门关联变更
- 添加数据库迁移脚本employee_org_no_to_dept_id.sql
- 新增员工信息分页接口测试脚本(PowerShell/Python)
- 更新CLAUDE.md，添加MCP数据库工具使用说明

Co-Authored-By: Claude (glm-4.7) <noreply@anthropic.com>

ruoyi-dpc/src/main/resources/mapper/dpc/DpcEmployeeMapper.xml

@@ -8,7 +8,8 @@
         <id property="employeeId" column="employee_id"/>
         <result property="name" column="name"/>
         <result property="tellerNo" column="teller_no"/>
-        <result property="orgNo" column="org_no"/>
+        <result property="deptId" column="dept_id"/>
+        <result property="deptName" column="dept_name"/>
         <result property="idCard" column="id_card"/>
         <result property="phone" column="phone"/>
         <result property="hireDate" column="hire_date"/>
@@ -24,9 +25,35 @@
         </collection>
     </resultMap>
 
+    <select id="selectEmployeePageWithDept" resultMap="DpcEmployeeVOResult">
+        SELECT
+            e.employee_id, e.name, e.teller_no, e.dept_id, e.id_card, e.phone, e.hire_date, e.status, e.create_time,
+            d.dept_name
+        FROM dpc_employee e
+        LEFT JOIN sys_dept d ON e.dept_id = d.dept_id
+        <where>
+            <if test="query.name != null and query.name != ''">
+                AND e.name LIKE CONCAT('%', #{query.name}, '%')
+            </if>
+            <if test="query.tellerNo != null and query.tellerNo != ''">
+                AND e.teller_no = #{query.tellerNo}
+            </if>
+            <if test="query.deptId != null">
+                AND e.dept_id = #{query.deptId}
+            </if>
+            <if test="query.idCard != null and query.idCard != ''">
+                AND e.id_card = #{query.idCard}
+            </if>
+            <if test="query.status != null and query.status != ''">
+                AND e.status = #{query.status}
+            </if>
+        </where>
+        ORDER BY e.create_time DESC
+    </select>
+
     <select id="selectEmployeeWithRelatives" parameterType="Long" resultMap="DpcEmployeeVOResult">
         SELECT
-            e.employee_id, e.name, e.teller_no, e.org_no, e.id_card, e.phone, e.hire_date, e.status, e.create_time,
+            e.employee_id, e.name, e.teller_no, e.dept_id, e.id_card, e.phone, e.hire_date, e.status, e.create_time,
             r.relative_id, r.employee_id, r.relative_name, r.relative_id_card, r.relative_phone, r.relationship
         FROM dpc_employee e
         LEFT JOIN dpc_employee_relative r ON e.employee_id = r.employee_id