移除未使用的 DirectProject 输入信封类型

删除未被调用且未生成到前端绑定的 DirectCodexUserMessageEnvelope，收窄内部 API。

apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_user_item/mod.rs

@@ -5,8 +5,8 @@ mod validation;
 mod wire;
 
 pub(crate) use model::{
-    DirectCodexUserContentPart, DirectCodexUserItem, DirectCodexUserMessageEnvelope,
-    DirectCodexUserMessageItem, DirectCodexUserRole, DirectCodexUserRuntimeRegionPart,
+    DirectCodexUserContentPart, DirectCodexUserItem, DirectCodexUserMessageItem,
+    DirectCodexUserRole, DirectCodexUserRuntimeRegionPart,
 };
 pub(crate) use validation::validate_direct_codex_user_item;
 pub(crate) use wire::{

apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_user_item/model.rs

@@ -61,13 +61,6 @@ pub(crate) struct DirectCodexUserRuntimeRegionPart {
     pub(crate) resource_ids: Vec<String>,
 }
 
-#[derive(Clone, Debug, Deserialize, Serialize, TS)]
-#[serde(rename_all = "camelCase", deny_unknown_fields)]
-#[ts(export, export_to = concat!(env!("CARGO_MANIFEST_DIR"), "/../src/features/project-workspace/generated/"))]
-pub(crate) struct DirectCodexUserMessageEnvelope {
-    pub(crate) item: DirectCodexUserItem,
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;