fix(后台接口): 会员升级与档位目录的业务拒绝改为 400

- runtime_profile.rs：新增 is_runtime_profile_membership_domain_error，会员升级报价（非会员 / 重复购买 / 月年互换 / 档位下架 / 非法报价入参）与会员档位目录校验失败统一映射为 400，基础设施错误仍保持 502

Co-authored-by: Junie <junie@jetbrains.com>

server-rs/crates/api-server/src/runtime_profile.rs

@@ -1484,14 +1484,14 @@ pub async fn get_profile_play_stats(
 }
 
 fn map_runtime_profile_client_error(error: SpacetimeClientError) -> AppError {
-    let is_redeem_code_domain_error = matches!(
+    let is_domain_error = matches!(
         &error,
         SpacetimeClientError::Procedure(message)
-            if is_runtime_profile_redeem_code_domain_error(message)
+            if is_runtime_profile_domain_error(message)
     );
     let (status, provider) = match &error {
         SpacetimeClientError::Runtime(_) => (StatusCode::BAD_REQUEST, "runtime-profile"),
-        SpacetimeClientError::Procedure(_) if is_redeem_code_domain_error => {
+        SpacetimeClientError::Procedure(_) if is_domain_error => {
             (StatusCode::BAD_REQUEST, "runtime-profile")
         }
         _ => (StatusCode::BAD_GATEWAY, "spacetimedb"),
@@ -1501,12 +1501,29 @@ fn map_runtime_profile_client_error(error: SpacetimeClientError) -> AppError {
         "provider": provider,
         "message": error.to_string(),
     }));
-    if is_redeem_code_domain_error {
+    if is_domain_error {
         return app_error.with_message(error.to_string());
     }
     app_error
 }
 
+/// 模块侧的可读业务拒绝以 400 返回，基础设施错误保持 502。
+fn is_runtime_profile_domain_error(message: &str) -> bool {
+    is_runtime_profile_redeem_code_domain_error(message)
+        || is_runtime_profile_membership_domain_error(message)
+}
+
+fn is_runtime_profile_membership_domain_error(message: &str) -> bool {
+    message.starts_with("会员升级被拒绝: ")
+        || message.starts_with("会员档位")
+        || matches!(
+            message,
+            "当前不是会员，请直接选择套餐购买"
+                | "当前套餐已生效，无需重复购买"
+                | "当前会员有效期内不支持月付 / 年付转换，到期后可重新选择"
+        )
+}
+
 fn is_runtime_profile_redeem_code_domain_error(message: &str) -> bool {
     matches!(
         message,