feat: 登录即自动绑定云端并同步，免手动配置

intern-log/src/views/LoginView.vue

@@ -78,7 +78,7 @@ async function submit() {
         {{ mode === 'login' ? '登录' : '创建并进入' }}
       </button>
       <div class="muted login-note">
-        登录密码仅在本机用于身份校验，系统只保存密码的 PBKDF2 哈希；忘记密码将无法访问该用户数据
+        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
       </div>
     </div>
   </div>

intern-log/src/views/SettingsView.vue

@@ -13,7 +13,8 @@ import { downloadCsv } from '../lib/csv'
 import { hhmm, parseDateStr, todayStr } from '../lib/date'
 import { computeDay } from '../domain/attendance'
 import { changeLoginPassword, deleteCurrentUser, getSession } from '../db/auth'
-import { getSyncLastTime, isSyncConfigured, registerCloudAccount, runSync, type SyncResult } from '../sync/engine'
+import { ensureCloudBinding, getSyncBase, getSyncLastTime, syncWithStoredConfig, type SyncResult } from '../sync/engine'
+import { getCloudCreds } from '../db/auth'
 import { showToast } from '../lib/toast'
 
 const rule = ref<WorkRule>({ work_start: '09:00', work_end: '18:00', grace_minutes: 10, lunch_minutes: 60, remind_weekly: 'friday' })
@@ -36,35 +37,30 @@ const newLoginPwd2 = ref('')
 const accError = ref('')
 const deleteAccConfirm = ref(false)
 const syncBase = ref('')
-const syncUser = ref('')
-const syncPwd = ref('')
+const cloudUser = ref('')
 const syncStatus = ref('')
 const syncError = ref('')
 const syncing = ref(false)
 const lastSync = ref('')
 
 async function loadSyncInfo() {
-  syncBase.value = await getSetting('sync_base_url', '')
-  syncUser.value = await getSetting('sync_username', '')
-  syncPwd.value = await getSetting('sync_password', '')
+  syncBase.value = await getSyncBase()
+  cloudUser.value = getCloudCreds()?.username || ''
   lastSync.value = await getSyncLastTime()
 }
 
 async function saveSyncConfig() {
   await setSetting('sync_base_url', syncBase.value.trim())
-  await setSetting('sync_username', syncUser.value.trim())
-  await setSetting('sync_password', syncPwd.value)
-  showToast('同步配置已保存')
+  showToast('同步地址已保存')
 }
 
-async function registerCloud() {
+async function rebindCloud() {
   syncError.value = ''
   try {
-    await registerCloudAccount(syncBase.value, syncUser.value, syncPwd.value)
-    await saveSyncConfig()
-    showToast('云端账号已注册，可直接同步')
+    await ensureCloudBinding()
+    showToast('云端绑定已重建')
   } catch (e) {
-    syncError.value = e instanceof Error ? e.message : '注册失败'
+    syncError.value = e instanceof Error ? e.message : '绑定失败'
   }
 }
 
@@ -74,7 +70,7 @@ async function doSyncNow() {
   syncing.value = true
   try {
     await saveSyncConfig()
-    const result: SyncResult = await runSync({ baseUrl: syncBase.value, username: syncUser.value, password: syncPwd.value })
+    const result: SyncResult = await syncWithStoredConfig()
     lastSync.value = result.at
     syncStatus.value = '推送 ' + result.pushed + ' 条 · 拉取 ' + result.pulled + ' 条 · 删除 ' + result.removed + ' 条'
     showToast('同步完成')
@@ -343,24 +339,15 @@ async function doImport() {
 
     <div class="card section">
       <div class="section-title">多端数据同步</div>
-      <div class="muted acc-line">在自建同步服务端注册云端账号后，手机（PWA）、桌面与网页端登录同一账号即可互通数据；密码库以密文同步，主密码永不出本机</div>
-      <div class="ai-grid">
-        <div class="rule-item">
-          <label>同步服务地址</label>
-          <input class="input" v-model="syncBase" placeholder="如 https://daywk.linyux.cn" />
-        </div>
-        <div class="rule-item">
-          <label>云端用户名</label>
-          <input class="input" v-model="syncUser" placeholder="云端账号用户名" />
-        </div>
-        <div class="rule-item">
-          <label>云端密码（至少 6 位）</label>
-          <input type="password" class="input" v-model="syncPwd" placeholder="云端账号密码" />
-        </div>
+      <div class="muted acc-line">云端账号：{{ cloudUser || '未绑定' }} · 登录即自动绑定并同步（变更实时推送 + 每 5 分钟兜底）；密码库以密文同步，主密码永不出本机</div>
+      <div class="rule-item">
+        <label>同步服务地址（默认即可）</label>
+        <input class="input" v-model="syncBase" placeholder="https://daywk.linyux.cn" />
       </div>
       <div class="rule-save">
-        <button class="btn btn-sm" @click="registerCloud">注册云端账号</button>
+        <button class="btn btn-sm" @click="saveSyncConfig">保存地址</button>
         <button class="btn btn-primary btn-sm" :disabled="syncing" @click="doSyncNow">{{ syncing ? '同步中' : '立即同步' }}</button>
+        <button class="btn btn-sm" @click="rebindCloud">重建云端绑定</button>
       </div>
       <div v-if="syncStatus" class="muted acc-line">上次同步：{{ lastSync || '--' }} · {{ syncStatus }}</div>
       <div v-if="syncError" class="form-error">{{ syncError }}</div>