feat(auth,mp): 患者登录流程优化 — 智能合并 + 角色冻结 + 页面冻结

- 智能合并：微信注册时用手机号盲索引匹配已有患者档案，避免重复建
  档（AuthState 添加 PiiCrypto + ensure_patient_record 增加盲索引查询）
- 角色冻结：小程序仅允许患者角色登录，医护角色被拦截
  （auth_service.rs 添加反向拦截 + 登录页移除 credential login 表单）
- 页面冻结：10 个非核心页面替换为 FrozenPage 占位组件（用药/知情同意
  /透析/家属/诊断/事件），移除 profile 导航入口，移除医生端预加载
- 医生端代码保留，仅隐藏入口，后续可零成本恢复

讨论记录：docs/discussions/2026-05-23-account-registration-login-flow.md

apps/miniprogram/src/pages/login/index.tsx

@@ -1,5 +1,5 @@
 import { useState } from 'react';
-import { View, Text, Input, Button } from '@tarojs/components';
+import { View, Text, Button } from '@tarojs/components';
 import Taro from '@tarojs/taro';
 import { safeNavigateTo } from '@/utils/navigate';
 import { useAuthStore } from '../../stores/auth';
@@ -11,9 +11,6 @@ const IS_DEV = process.env.NODE_ENV !== 'production';
 const IS_SIMULATOR = typeof __wxConfig !== 'undefined' && (__wxConfig as Record<string, unknown>)?.envVersion === 'develop';
 
 export default function Login() {
-  const [username, setUsername] = useState('');
-  const [password, setPassword] = useState('');
-  const [showPassword, setShowPassword] = useState(false);
   const [agreed, setAgreed] = useState(false);
   const [needBind, setNeedBind] = useState(false);
 
@@ -25,12 +22,9 @@ export default function Login() {
 
   const navigateAfterLogin = () => {
     if (isMedicalStaff()) {
-      // 使用 redirectTo 替代 reLaunch 避免分包加载超时
-      // redirectTo 只替换当前页面，不销毁整个页栈，分包预加载不会被中断
       Taro.redirectTo({
         url: '/pages/pkg-doctor-core/index',
         fail: () => {
-          // fallback: 先跳首页再 redirectTo
           Taro.switchTab({
             url: '/pages/index/index',
             success: () => {
@@ -46,32 +40,6 @@ export default function Login() {
     }
   };
 
-  const handleCredentialLogin = async () => {
-    if (!username.trim()) {
-      Taro.showToast({ title: '请输入账号', icon: 'none' });
-      return;
-    }
-    if (!password.trim()) {
-      Taro.showToast({ title: '请输入密码', icon: 'none' });
-      return;
-    }
-    if (!agreed) {
-      Taro.showToast({ title: '请先阅读并同意用户协议', icon: 'none' });
-      return;
-    }
-    try {
-      const success = await credentialLogin(username.trim(), password);
-      if (success) {
-        navigateAfterLogin();
-      } else {
-        Taro.showToast({ title: '账号或密码错误', icon: 'none' });
-      }
-    } catch (err) {
-      console.warn('[login] 登录失败:', err);
-      Taro.showToast({ title: '登录失败，请重试', icon: 'none' });
-    }
-  };
-
   const handleWechatLogin = async () => {
     if (!agreed) {
       Taro.showToast({ title: '请先阅读并同意用户协议', icon: 'none' });
@@ -144,49 +112,6 @@ export default function Login() {
 
       {!needBind ? (
         <>
-          {/* 账号输入 */}
-          <View className="login-field">
-            <Input
-              className="login-input"
-              type="text"
-              placeholder="请输入账号"
-              placeholderClass="login-placeholder"
-              value={username}
-              onInput={(e) => setUsername(e.detail.value)}
-            />
-          </View>
-
-          {/* 密码输入 */}
-          <View className="login-field">
-            <Input
-              className="login-input"
-              type="safe-password"
-              password={!showPassword}
-              placeholder="请输入密码"
-              placeholderClass="login-placeholder"
-              value={password}
-              onInput={(e) => setPassword(e.detail.value)}
-            />
-            <Text
-              className="login-eye"
-              onClick={() => setShowPassword(!showPassword)}
-            >
-              {showPassword ? '隐藏' : '显示'}
-            </Text>
-          </View>
-
-          {/* 登录按钮 */}
-          <View className="login-submit" onClick={handleCredentialLogin}>
-            <Text className="login-submit-text">{loading ? '登录中...' : '登录'}</Text>
-          </View>
-
-          {/* 分隔线 */}
-          <View className="login-divider">
-            <View className="login-divider-line" />
-            <Text className="login-divider-text">或</Text>
-            <View className="login-divider-line" />
-          </View>
-
           {/* 微信一键登录 */}
           <View className="login-wechat-btn" onClick={handleWechatLogin}>
             <Text className="login-wechat-icon">微</Text>