feat: 培训/绩效/违纪员工端签收+管理端签字状态只读化

- 后端: portal新增培训/绩效/违纪列表查看+签收接口，签收时创建证据链
- 管理端: 弹窗去掉HR手动签字勾选，改为只读显示签字状态
- 绩效列表新增签字状态列
- 员工端: 新增MyRecords页面，支持培训签收/拒绝、绩效签字、违纪签字
- 员工端导航新增'我的记录'入口
- EvidenceCategory新增TRAINING/PERFORMANCE类型

frontend/src/pages/roster/DisciplinaryRecords.tsx

@@ -193,7 +193,6 @@ function DisciplinaryForm({ employees, record, onSubmit, onClose }: {
     severity: record?.severity || 'WARNING',
     action: record?.action || 'ORAL_WARNING',
     actionDetail: record?.actionDetail || '',
-    employeeAck: record?.employeeAck || false,
     witness: record?.witness || '',
   })
 
@@ -263,10 +262,18 @@ function DisciplinaryForm({ employees, record, onSubmit, onClose }: {
             <Label>见证人</Label>
             <Input value={form.witness} onChange={(e) => setForm({ ...form, witness: e.target.value })} placeholder="见证人（选填）" />
           </div>
-          <label className="flex items-center gap-2">
-            <input type="checkbox" checked={form.employeeAck} onChange={(e) => setForm({ ...form, employeeAck: e.target.checked })} />
-            <span className="text-sm">员工已签字确认</span>
-          </label>
+          {record && (
+            <div>
+              <Label>签字状态</Label>
+              <div className="text-sm text-gray-600">
+                {record.employeeAck ? (
+                  <span className="text-green-600">已签字（{record.ackDate ? new Date(record.ackDate).toLocaleDateString('zh-CN') : ''}）</span>
+                ) : (
+                  <span className="text-amber-600">待签字 <span className="text-xs text-gray-400 ml-1">由员工在员工端签字确认</span></span>
+                )}
+              </div>
+            </div>
+          )}
           <div className="flex justify-end gap-2 pt-2">
             <Button variant="secondary" size="sm" onClick={onClose}>取消</Button>
             <Button size="sm" onClick={() => onSubmit(form)} disabled={!form.employeeId || !form.description}>保存</Button>

frontend/src/pages/roster/PerformanceRecords.tsx

@@ -99,14 +99,15 @@ export default function PerformanceRecords() {
               <th className="pb-2 pr-4 font-medium">等级</th>
               <th className="pb-2 pr-4 font-medium">结果</th>
               <th className="pb-2 pr-4 font-medium">考评人</th>
+              <th className="pb-2 pr-4 font-medium">签字</th>
               <th className="pb-2 pr-4 font-medium">操作</th>
             </tr>
           </thead>
           <tbody>
             {isLoading ? (
-              <tr><td colSpan={8} className="py-8 text-center text-gray-400">加载中...</td></tr>
+              <tr><td colSpan={9} className="py-8 text-center text-gray-400">加载中...</td></tr>
             ) : records.length === 0 ? (
-              <tr><td colSpan={8} className="py-8 text-center text-gray-400">暂无绩效记录</td></tr>
+              <tr><td colSpan={9} className="py-8 text-center text-gray-400">暂无绩效记录</td></tr>
             ) : records.map((r: any) => (
               <tr key={r.id} className="border-b hover:bg-gray-50">
                 <td className="py-2 pr-4">
@@ -122,6 +123,13 @@ export default function PerformanceRecords() {
                   </span>
                 </td>
                 <td className="py-2 pr-4 text-gray-600">{r.reviewer || '-'}</td>
+                <td className="py-2 pr-4">
+                  {r.employeeAck ? (
+                    <span className="text-xs text-green-600">已签字</span>
+                  ) : (
+                    <span className="text-xs text-amber-600">待签字</span>
+                  )}
+                </td>
                 <td className="py-2 pr-4">
                   <div className="flex gap-1">
                     <button onClick={() => setEditRecord(r)} className="p-1 hover:bg-gray-100 rounded">
@@ -179,7 +187,6 @@ function PerformanceForm({ employees, record, onSubmit, onClose }: {
     summary: record?.summary || '',
     improvementPlan: record?.improvementPlan || '',
     reviewer: record?.reviewer || '',
-    employeeAck: record?.employeeAck || false,
   })
 
   return (
@@ -241,6 +248,18 @@ function PerformanceForm({ employees, record, onSubmit, onClose }: {
             <Label>改进计划</Label>
             <Input value={form.improvementPlan} onChange={(e) => setForm({ ...form, improvementPlan: e.target.value })} placeholder="改进计划（选填）" />
           </div>
+          {record && (
+            <div>
+              <Label>签字状态</Label>
+              <div className="text-sm text-gray-600">
+                {record.employeeAck ? (
+                  <span className="text-green-600">已签字（{record.ackDate ? new Date(record.ackDate).toLocaleDateString('zh-CN') : ''}）</span>
+                ) : (
+                  <span className="text-amber-600">待签字 <span className="text-xs text-gray-400 ml-1">由员工在员工端签字确认</span></span>
+                )}
+              </div>
+            </div>
+          )}
           <div className="flex justify-end gap-2 pt-2">
             <Button variant="secondary" size="sm" onClick={onClose}>取消</Button>
             <Button size="sm" onClick={() => onSubmit(form)} disabled={!form.employeeId || !form.period}>保存</Button>

frontend/src/pages/roster/TrainingRecords.tsx

@@ -197,7 +197,6 @@ function TrainingForm({ employees, record, onSubmit, onClose }: {
     content: record?.content || '',
     trainer: record?.trainer || '',
     duration: record?.duration || 0,
-    ackStatus: record?.ackStatus || 'PENDING',
     remark: record?.remark || '',
   })
 
@@ -242,14 +241,17 @@ function TrainingForm({ employees, record, onSubmit, onClose }: {
               <Input type="number" min={0} step={0.5} value={form.duration} onChange={(e) => setForm({ ...form, duration: Number(e.target.value) })} />
             </div>
           </div>
-          <div>
-            <Label>签收状态</Label>
-            <Select value={form.ackStatus} onChange={(e) => setForm({ ...form, ackStatus: e.target.value })}>
-              <option value="PENDING">待签收</option>
-              <option value="SIGNED">已签收</option>
-              <option value="REFUSED">拒绝签收</option>
-            </Select>
-          </div>
+          {record && (
+            <div>
+              <Label>签收状态</Label>
+              <div className="text-sm text-gray-600">
+                <span className={`inline-block px-2 py-0.5 rounded text-xs ${ACK_COLORS[record.ackStatus] || 'bg-gray-50 text-gray-600'}`}>
+                  {ACK_LABELS[record.ackStatus] || record.ackStatus}
+                </span>
+                <span className="ml-2 text-xs text-gray-400">由员工在员工端签收</span>
+              </div>
+            </div>
+          )}
           <div>
             <Label>备注</Label>
             <Input value={form.remark} onChange={(e) => setForm({ ...form, remark: e.target.value })} placeholder="备注" />