feat(tree): checkpoint resource lifecycle work

提交当前顶层 mnote Git 工作区，范围集中在 04-tree-domain 的 resource/trash/filetree 生命周期、mnote-web resource_trash 路由、Convex/Next 兼容接口、sidebar/file-tree 客户端适配、smoke 脚本与对应设计/bug 记录。

不包含被 ignore 的 design/05-editor-mainline/reference-code/leptos-tiptap 嵌套仓库改动。新增 smoke 的测试密码改为运行时读取 MNOTE_E2E_PASSWORD，避免提交明文 credential assignment。

rust/crates/mnote-web/src/routes/kernel.rs

@@ -318,7 +318,7 @@ mod tests {
     }
 
     #[tokio::test]
-    async fn file_tree_projection_includes_index_and_asset_rows() {
+    async fn file_tree_projection_includes_page_markdown_and_asset_rows() {
         let response = app()
             .oneshot(
                 Request::builder()
@@ -345,16 +345,14 @@ mod tests {
             .collect::<Vec<_>>();
 
         assert!(row_kinds.contains(&"document"));
-        assert!(row_kinds.contains(&"index"));
         assert!(row_kinds.contains(&"asset"));
         assert!(row_kinds.contains(&"asset_folder"));
         assert!(resource_kinds.contains(&"document"));
-        assert!(resource_kinds.contains(&"index"));
         assert!(resource_kinds.contains(&"asset"));
         assert!(resource_kinds.contains(&"mindmap"));
         assert!(resource_kinds.contains(&"table"));
         assert_eq!(items[0]["nodeId"], "page_root");
-        assert_eq!(items[1]["nodeId"], "index:page_root");
+        assert_eq!(items[0]["title"], "工作区首页.md");
     }
 
     #[tokio::test]