architecture: 数据唯一权威迁至服务器——本地降级为实时缓存，写后即时推送+快照重建；账号登录转为云端原生（新增 /api/auth/password、/api/auth/delete、每日自动备份）

intern-log/src/views/LoginView.vue

@@ -1,7 +1,7 @@
 <script setup lang="ts">
-import { onMounted, ref } from 'vue'
+import { ref } from 'vue'
 import Icon from '../components/Icon.vue'
-import { createUser, legacyDataExists, login, type Session } from '../db/auth'
+import { createUser, login, type Session } from '../db/auth'
 
 const emit = defineEmits<{ (e: 'login', s: Session): void }>()
 
@@ -9,15 +9,9 @@ const mode = ref<'login' | 'create'>('login')
 const username = ref('')
 const password = ref('')
 const password2 = ref('')
-const migrate = ref(true)
-const legacyExists = ref(false)
 const error = ref('')
 const busy = ref(false)
 
-onMounted(async () => {
-  legacyExists.value = await legacyDataExists()
-})
-
 function switchMode(m: 'login' | 'create') {
   mode.value = m
   error.value = ''
@@ -43,7 +37,7 @@ async function submit() {
         busy.value = false
         return
       }
-      s = await createUser(username.value, password.value, migrate.value)
+      s = await createUser(username.value, password.value)
     }
     emit('login', s)
   } catch (e) {
@@ -60,7 +54,7 @@ async function submit() {
         <div class="brand-icon"><Icon name="calendar" :size="22" /></div>
         <div class="login-title">实习工作日志</div>
         <div class="muted login-sub">打卡 · 记录 · 总结 · 备忘录 · 密码库</div>
-        <div class="muted login-sub">每位用户独立数据库，数据彼此隔离并保存在本机</div>
+        <div class="muted login-sub">数据保存在云端服务器，所有设备登录同一账号即可实时同步</div>
       </div>
       <div class="seg">
         <button class="seg-btn" :class="{ active: mode === 'login' }" @click="switchMode('login')">登录</button>
@@ -69,16 +63,12 @@ async function submit() {
       <input class="input" v-model="username" placeholder="用户名（2 到 20 个字符）" @keydown.enter="submit" />
       <input type="password" class="input" v-model="password" :placeholder="mode === 'login' ? '登录密码' : '设置登录密码（至少 6 位）'" @keydown.enter="submit" />
       <input v-if="mode === 'create'" type="password" class="input" v-model="password2" placeholder="再次输入密码" @keydown.enter="submit" />
-      <label v-if="mode === 'create' && legacyExists" class="mig-row">
-        <input type="checkbox" v-model="migrate" />
-        <span>导入本机原有工作日志数据到此用户（原数据保留不删除）</span>
-      </label>
       <div v-if="error" class="form-error">{{ error }}</div>
       <button class="btn btn-primary login-btn" :disabled="busy" @click="submit">
         {{ mode === 'login' ? '登录' : '创建并进入' }}
       </button>
       <div class="muted login-note">
-        登录后自动开启云端同步（密码会保存在本机用于云同步）；系统只保存密码哈希，忘记密码将无法访问该用户数据
+        登录密码仅服务器保存哈希；本机保存加密的自动登录凭据，登录后无需重复输入
       </div>
     </div>
   </div>