feat: 打手支持昵称登录，物品规则标识唯一校验

- 昵称全局唯一（迁移 016 唯一索引 + 注册校验），存量空昵称自动补账号名
- 登录解析链扩展为 账号/手机号/昵称，均可加密码登录
- 登录页提示更新为「手机号 / 昵称 / 账号」，注册页提示昵称可作登录账号
- 新建物品规则时校验规则标识唯一：已存在则拒绝（409），编辑不受影响
- 前端规则表单增加规则标识重复的即时校验

apps/frontend/src/pages/admin/panels/ProductRulesPanel.tsx

@@ -102,6 +102,7 @@ export default function ProductRulesPanel() {
   })
 
   async function saveRule(values: {
+    ruleId?: number
     ruleKey: string
     provider?: string
     platform?: string
@@ -124,7 +125,10 @@ export default function ProductRulesPanel() {
     autoCreate?: boolean
   }) {
     try {
-      await saveAdminWorkProductRule(values)
+      await saveAdminWorkProductRule({
+        ...values,
+        ruleId: editingRule?.ruleId,
+      })
       message.success(editingRule ? '物品规则已更新' : '物品规则已创建')
       resetRuleForm()
       await Promise.all([
@@ -346,7 +350,23 @@ export default function ProductRulesPanel() {
             <Form.Item
               label="规则标识"
               name="ruleKey"
-              rules={[{ required: true, message: '请输入规则标识' }]}
+              rules={[
+                { required: true, message: '请输入规则标识' },
+                {
+                  validator: (_, value) => {
+                    const key = String(value || '').trim()
+                    if (
+                      !editingRule &&
+                      (rulesQuery.data?.data.items || []).some(
+                        (rule) => rule.ruleKey === key,
+                      )
+                    ) {
+                      return Promise.reject(new Error('规则标识已存在，请更换'))
+                    }
+                    return Promise.resolve()
+                  },
+                },
+              ]}
             >
               <Input placeholder="skin-training" disabled={Boolean(editingRule)} />
             </Form.Item>

apps/frontend/src/pages/worker/WorkerLoginPage.tsx

@@ -167,15 +167,19 @@ export default function WorkerLoginPage() {
                     <>
                       <div className="auth-form-header">
                         <h1>欢迎回来</h1>
-                        <p>使用账号或手机号登录，进入抢单大厅</p>
+                        <p>使用手机号、昵称或账号登录，进入抢单大厅</p>
                       </div>
                       <Form layout="vertical" onFinish={submitLogin} requiredMark={false}>
                         <Form.Item
-                          label="账号 / 手机号"
+                          label="手机号 / 昵称 / 账号"
                           name="username"
-                          rules={[{ required: true, message: '请输入账号或手机号' }]}
+                          rules={[{ required: true, message: '请输入手机号、昵称或账号' }]}
                         >
-                          <Input prefix={<UserOutlined />} autoComplete="username" />
+                          <Input
+                            prefix={<UserOutlined />}
+                            autoComplete="username"
+                            placeholder="手机号 / 昵称 / 账号"
+                          />
                         </Form.Item>
                         <Form.Item
                           label="密码"
@@ -252,6 +256,7 @@ export default function WorkerLoginPage() {
                           label="昵称"
                           name="displayName"
                           rules={[{ required: true, message: '请输入昵称' }]}
+                          extra="昵称需唯一，注册后可作为登录账号使用"
                         >
                           <Input prefix={<UserOutlined />} />
                         </Form.Item>

apps/frontend/src/services/admin/worker-platform.ts

@@ -87,6 +87,7 @@ export function fetchAdminWorkProductRules(params?: Record<string, unknown>) {
 }
 
 export function saveAdminWorkProductRule(payload: {
+  ruleId?: number
   ruleKey: string
   provider?: string
   platform?: string