feat(desktop): implement phase 1 tauri client

frontend/src/views/Login.vue

@@ -198,6 +198,9 @@
             <!-- 注册与忘记密码（左右分立） -->
             <div class="forgot-register-row">
               <RouterLink to="/forgot-password" class="forgot-link">忘记密码？</RouterLink>
+              <RouterLink v-if="showDesktopServerSettings" to="/desktop/server-settings" class="server-settings-link">
+                服务器设置
+              </RouterLink>
               <RouterLink to="/register" class="register-link">新用户注册</RouterLink>
             </div>
           </el-form>
@@ -257,6 +260,7 @@ import { useAuthStore } from "../store/auth";
 import { useStudyStore } from "../store/study";
 import { fetchEmailDomains } from "../api/auth";
 import { TEXT, requiredMessage } from "../locales";
+import { isTauriRuntime } from "../runtime/platform";
 import {
   consumeLogoutReason,
   LOGOUT_REASON_AUTH_EXPIRED,
@@ -287,6 +291,7 @@ const protocolDialogVisible = ref(false);
 const logoutNotice = ref<{ type: "info" | "warning"; title: string; message: string } | null>(null);
 const loginError = ref<{ title: string; message?: string } | null>(null);
 const protocolSections = authProtocolSections;
+const showDesktopServerSettings = isTauriRuntime();
 
 const normalizeDomain = (value: string) => value.trim().toLowerCase().replace(/^@/, "");
 const availableEmailDomains = computed(() => Array.from(new Set([
@@ -353,7 +358,7 @@ onMounted(async () => {
   form.agreeProtocol = localStorage.getItem(AGREE_PROTOCOL_KEY) === "true";
 });
 
-watch(() => form.agreeProtocol, (v) => localStorage.setItem(AGREE_PROTOCOL_KEY, String(v)));
+watch(() => form.agreeProtocol, (checked) => localStorage.setItem(AGREE_PROTOCOL_KEY, String(checked)));
 watch(() => [form.emailLocal, form.emailDomain], syncEmailFromParts);
 
 const openProtocolDialog = () => { protocolDialogVisible.value = true; };
@@ -371,7 +376,11 @@ const onSubmit = async () => {
     const studyStore = useStudyStore();
     const userKey = auth.user?.email || form.email;
     await studyStore.restoreStudyForUser(userKey, { preferActive: !!auth.user?.is_admin });
-    router.push(studyStore.currentStudy ? "/project/overview" : auth.user?.is_admin ? "/admin/users" : "/admin/projects");
+    if (studyStore.currentStudy) {
+      router.push("/project/overview");
+    } else {
+      router.push(auth.user?.is_admin ? "/admin/users" : "/admin/projects");
+    }
   } catch (error: any) {
     const status = error?.response?.status;
     const detail: string = error?.response?.data?.detail || error?.response?.data?.message || "";
@@ -704,8 +713,8 @@ const onSubmit = async () => {
 
 /* 卡片容器 */
 .login-card-container {
-  width: 100%;
-  max-width: 380px;
+  width: clamp(480px, 34vw, 560px);
+  max-width: calc(100vw - 40px);
   display: flex;
   flex-direction: column;
 }
@@ -1040,7 +1049,7 @@ const onSubmit = async () => {
   margin-top: 20px;
 }
 
-.forgot-link, .register-link {
+.forgot-link, .register-link, .server-settings-link {
   font-size: 13px;
   color: #2563eb;
   text-decoration: none;
@@ -1048,7 +1057,7 @@ const onSubmit = async () => {
   transition: color 0.15s;
 }
 
-.forgot-link:hover, .register-link:hover {
+.forgot-link:hover, .register-link:hover, .server-settings-link:hover {
   color: #1d4ed8;
   text-decoration: underline;
 }