feat: 支持从小程序获取微信头像和昵称同步到 H5

- 后端 UserProfileUpdate 新增 avatar_url 字段
- LoginPage 检测 URL 参数 name/avatar 并调用 updateUserProfile
- ProfilePage 头像卡片显示真实头像（有 avatar_url 时）
- ProfilePage 增加 基本信息-姓名 编辑字段

frontend/src/app/pages/ProfilePage.tsx

@@ -32,6 +32,7 @@ interface UserInfo {
   phone: string;
   email: string;
   address: string;
+  avatar_url: string | null;
   lastPeriod: string;
   dueDate: string;
   currentWeek: number;
@@ -59,6 +60,7 @@ export function ProfilePage() {
     phone: user.phone || "未设置",
     email: "",
     address: "",
+    avatar_url: user.avatar_url || null,
     lastPeriod: user.lastPeriodDate || "",
     dueDate: user.dueDate || "",
     currentWeek: user.currentWeek,
@@ -232,9 +234,13 @@ export function ProfilePage() {
           <Card className="bg-gradient-to-br from-morandi-400 to-morandi-500 border-0 text-white p-6 rounded-3xl shadow-sm">
             <div className="flex items-center gap-4">
               <div className="relative">
-                <div className="w-20 h-20 bg-white/20 backdrop-blur-sm rounded-full flex items-center justify-center">
-                  <User className="w-10 h-10 text-white" />
-                </div>
+                {userInfo.avatar_url ? (
+                  <img src={userInfo.avatar_url} alt="头像" className="w-20 h-20 rounded-full object-cover" />
+                ) : (
+                  <div className="w-20 h-20 bg-white/20 backdrop-blur-sm rounded-full flex items-center justify-center">
+                    <User className="w-10 h-10 text-white" />
+                  </div>
+                )}
                 <button className="absolute bottom-0 right-0 w-6 h-6 bg-white rounded-full flex items-center justify-center shadow-sm">
                   <Camera className="w-3 h-3 text-morandi-500" />
                 </button>
@@ -252,6 +258,26 @@ export function ProfilePage() {
           </Card>
         </motion.div>
 
+        {/* 基本信息 */}
+        <motion.div
+          initial={{ opacity: 0, y: 20 }}
+          animate={{ opacity: 1, y: 0 }}
+          transition={{ delay: 0.05 }}
+        >
+          <h2 className="text-base font-semibold text-gray-800 mb-3 flex items-center gap-2">
+            <User className="w-5 h-5 text-morandi-500" />
+            基本信息
+          </h2>
+          <Card className="bg-white rounded-2xl p-5 shadow-sm border-0">
+            <InfoItem
+              label="姓名"
+              value={userInfo.name}
+              field="name"
+              icon={User}
+            />
+          </Card>
+        </motion.div>
+
         {/* 孕期信息 */}
         <motion.div
           initial={{ opacity: 0, y: 20 }}