feat: select school before connecting timetable

mobile/lib/features/exams/exams_page.dart

@@ -118,7 +118,7 @@ class ExamsPage extends StatelessWidget {
           ),
           const SizedBox(height: 12),
           const Text(
-            '连接研究生系统，或导入学校考试页面的 HTML。',
+            '选择学校连接教务系统，或导入学校考试页面的 HTML。',
             textAlign: TextAlign.center,
             style: TextStyle(fontSize: 13, height: 1.8),
           ),

mobile/lib/features/profile/profile_page.dart

@@ -18,6 +18,7 @@ class ProfilePage extends StatelessWidget {
     super.key,
     required this.controller,
     required this.onLogin,
+    this.schoolName,
     this.authStatus = '未登录',
     this.onLogout,
     this.logoutLabel = '退出学校登录',
@@ -26,6 +27,7 @@ class ProfilePage extends StatelessWidget {
   });
   final AppController controller;
   final VoidCallback onLogin;
+  final String? schoolName;
   final VoidCallback? onLogout;
   final VoidCallback? onUpdateTerm;
   final String authStatus, logoutLabel;
@@ -98,12 +100,12 @@ class ProfilePage extends StatelessWidget {
               ),
               const SizedBox(height: 16),
               const Text(
-                '连接学校课表',
+                '学校课表',
                 style: TextStyle(fontSize: 20, fontWeight: FontWeight.w700),
               ),
               const SizedBox(height: 7),
               Text(
-                '电子科技大学 · 研究生\n$authStatus',
+                '${schoolName ?? '选择学校后连接教务系统'}\n$authStatus',
                 style: TextStyle(
                   fontSize: 12,
                   height: 1.8,
@@ -115,7 +117,7 @@ class ProfilePage extends StatelessWidget {
                 width: double.infinity,
                 child: FilledButton(
                   onPressed: onLogin,
-                  child: Text(onLogout == null ? '登录学校账户' : '打开学校课表'),
+                  child: const Text('选择学校'),
                 ),
               ),
               if (onLogout != null)

mobile/lib/features/school/school_selection_page.dart

@@ -0,0 +1,60 @@
+import 'package:flutter/material.dart';
+
+import '../../app/app_theme.dart';
+
+/// Only list schools whose login and import workflow is available.
+enum SupportedSchool {
+  uestcGraduate('电子科技大学（研究生）', '研究生课表与考试安排');
+
+  const SupportedSchool(this.label, this.description);
+  final String label, description;
+}
+
+class SchoolSelectionPage extends StatelessWidget {
+  const SchoolSelectionPage({super.key, this.selected});
+
+  final SupportedSchool? selected;
+
+  @override
+  Widget build(BuildContext context) => Scaffold(
+    appBar: AppBar(title: const Text('选择学校')),
+    body: SafeArea(
+      top: false,
+      child: ListView(
+        padding: const EdgeInsets.fromLTRB(22, 16, 22, 24),
+        children: [
+          Text(
+            '选择你的学校，登录后导入课表和考试。',
+            style: TextStyle(fontSize: 13, color: ink.withValues(alpha: 0.6)),
+          ),
+          const SizedBox(height: 20),
+          for (final school in SupportedSchool.values) ...[
+            SurfaceCard(
+              padding: EdgeInsets.zero,
+              child: ListTile(
+                contentPadding: const EdgeInsets.symmetric(
+                  horizontal: 16,
+                  vertical: 12,
+                ),
+                leading: const Icon(Icons.school_rounded, color: river),
+                title: Text(
+                  school.label,
+                  style: const TextStyle(fontWeight: FontWeight.w600),
+                ),
+                subtitle: Text(school.description),
+                trailing: Icon(
+                  school == selected
+                      ? Icons.check_circle_rounded
+                      : Icons.chevron_right_rounded,
+                  color: river,
+                ),
+                onTap: () => Navigator.pop(context, school),
+              ),
+            ),
+            const SizedBox(height: 12),
+          ],
+        ],
+      ),
+    ),
+  );
+}