收口本地工作区清理与资源投影

清理历史 Electron、Graphify、沙箱和截图等仓库跟踪残留，补充 CodeGraph 与 Convex active deploy source 协作说明。

新增 tree-first 下一阶段设计稿和 2026-05-20 清理总结，记录本地工作区、路径身份和 Zed/Lapce/VSCode 参考收口方向。

扩展 Rust Web 本地文件夹、DocumentBuffer、mindmap 资源、tree runtime 和页面聚合链路，并补充 task455 local-folder mindmap clean smoke。

验证：git diff --check 通过；pnpm store status --store-dir .pnpm-store 通过；npm ls --depth=0 --json 通过；find -L node_modules 未发现断链。cargo test -p mnote-web 当前 418 passed / 35 failed。

rust/crates/mnote-web/src/app.rs

@@ -1,4 +1,5 @@
 use crate::acp_runtime::AcpRuntimeManager;
+use crate::document_buffer_store::BufferStore;
 use crate::editor_actor::EditorRuntimeActor;
 use crate::local_folder_watcher_registry::LocalFolderWatcherRegistry;
 use crate::middleware::request_context::inject_request_context;
@@ -144,6 +145,7 @@ pub struct AppState {
     pub block_delta_tx: broadcast::Sender<serde_json::Value>,
     pub stream_delta_tx: broadcast::Sender<serde_json::Value>,
     pub acp_runtime: Arc<AcpRuntimeManager>,
+    pub buffer_store: BufferStore,
 }
 
 impl AppState {
@@ -152,13 +154,15 @@ impl AppState {
         let (stream_delta_tx, _) = broadcast::channel(256);
         let actor = EditorRuntimeActor::new();
         actor.set_block_delta_tx(block_delta_tx.clone());
+        let buffer_store = BufferStore::new();
         Self {
             config: Arc::new(config),
-            local_folder_watcher_registry: LocalFolderWatcherRegistry::new(),
+            local_folder_watcher_registry: LocalFolderWatcherRegistry::new(buffer_store.clone()),
             editor_actor: actor,
             block_delta_tx,
             stream_delta_tx,
             acp_runtime: Arc::new(AcpRuntimeManager::from_env()),
+            buffer_store,
         }
     }