隔离 Raw 图片代理实现

移除对现有图片编辑 client 与 curl transport 的复用

将 Raw GPT Image 2 请求、multipart 构造和响应解析收敛到独立文件

保持现有 editor 图片链路代码不变

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

@@ -14,9 +14,7 @@ use crate::{
     },
     auth::AuthenticatedAccessToken,
     http_error::AppError,
-    openai_image_generation::{
-        build_openai_image_http_client, map_platform_image_error, require_openai_image_settings,
-    },
+    openai_image_generation::{map_platform_image_error, require_openai_image_settings},
     request_context::RequestContext,
     state::AppState,
 };
@@ -63,14 +61,12 @@ pub(crate) async fn edit_raw_image(
         Some(authenticated.claims().user_id().to_string()),
         None,
     );
-    let http_client = build_openai_image_http_client(&settings)?;
     let provider_settings = settings.provider_settings();
     let user_id = authenticated.claims().user_id().to_string();
     let request_id = request_context.request_id().to_string();
     let points_cost = raw_image_edit_price(&state, prepared.width, prepared.height).await?;
     let operation = async move {
         let generated = create_vector_engine_raw_image_edit(
-            &http_client,
             &provider_settings,
             prepared.prompt.as_str(),
             &prepared.image,