feat: 收口文档桥接与 OnlyOffice/Sidebar 回归

- 为 documents.save/meta/content、blocks.patch 与 sidebar.dataset.list 补齐 Rust 协议映射、共享契约与桥接执行器

- 对齐 BlockNote、Mindmap、OnlyOffice 的保存/路由元信息，并补真实浏览器回归脚本与 OnlyOffice 部署基线

- 忽略 Rust 本地构建产物与 Harness 调试状态文件，避免临时产物进入仓库历史

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

@@ -15,6 +15,23 @@ pub struct GetPage {
     pub page_id: String,
 }
 
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct GetPageMeta {
+    pub page_id: String,
+    pub workspace_id: Option<String>,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct GetPageContent {
+    pub page_id: String,
+    pub workspace_id: Option<String>,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct ListSidebarDataset {
+    pub workspace_id: String,
+}
+
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct ListPageBlocks {
     pub page_id: String,