chore: 保存剩余工作区改动并清理到干净状态

- 补 OnlyOffice callback 附件写回的 media asset bridge 适配层，并继续扩展 documents bridge/测试覆盖

- 提交当前 OMX hooks 删除与 Harness 运行状态文件更新，保留本轮任务执行轨迹

- 一并提交仓库中已跟踪的 Rust target 构建产物与相关协议桥接变更，确保工作区清零

rust/crates/core-protocol/src/command.rs

@@ -72,6 +72,12 @@ pub struct UpdatePageOptions {
     pub embed_default_block_id: Option<String>,
 }
 
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct ReplaceMediaAssetStorage {
+    pub asset_id: String,
+    pub storage_id: String,
+}
+
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct SavePageContent {
     pub page_id: String,

rust/crates/core-protocol/src/lib.rs

@@ -6,8 +6,8 @@ pub mod tool;
 
 pub use command::{
     CommandEnvelope, CreatePage, CreateWorkspace, DeleteBlock, InsertBlock, MoveBlock,
-    PatchPageBlock, SavePageContent, UpdateBlock, UpdatePageOptions, UpdatePageStats,
-    UpdatePageTitle,
+    PatchPageBlock, ReplaceMediaAssetStorage, SavePageContent, UpdateBlock, UpdatePageOptions,
+    UpdatePageStats, UpdatePageTitle,
 };
 pub use common::{
     ActorPayload, AffectedObject, ErrorDetail, ErrorPayload, OkPayload, RequestMeta, ResponseMeta,