refactor: is_paid→is_member, paid_expires_at→membership_expires_at 全局重命名

src/models.rs

@@ -318,12 +318,12 @@ pub struct User {
     #[serde(rename = "desc")]
     #[sqlx(rename = "desc")]
     pub description: Option<String>,
-    #[sqlx(rename = "is_paid")]
-    pub is_paid: bool,
+    #[sqlx(rename = "is_member")]
+    pub is_member: bool,
     #[sqlx(rename = "is_admin")]
     pub is_admin: bool,
-    #[sqlx(rename = "paid_expires_at")]
-    pub paid_expires_at: Option<chrono::DateTime<chrono::Utc>>,
+    #[sqlx(rename = "membership_expires_at")]
+    pub membership_expires_at: Option<chrono::DateTime<chrono::Utc>>,
     #[serde(rename = "avatarUrl")]
     #[sqlx(rename = "avatar_url")]
     pub avatar_url: Option<String>,
@@ -335,8 +335,8 @@ pub struct User {
 // 管理员更新用户付费状态的请求体
 #[derive(Debug, Deserialize)]
 pub struct UpdatePaymentRequest {
-    pub is_paid: bool,
-    pub paid_expires_at: Option<String>, // ISO 8601 格式
+    pub is_member: bool,
+    pub membership_expires_at: Option<String>, // ISO 8601 格式
 }
 
 // 应用状态结构体