推进本地索引与 AI changed-files 审计

- 为本地工作区补充 search/backlinks/tags/resource 引用索引与 watcher 单文件刷新
- 在页面设置中增加索引页签，并展示本地反链、标签和 AI changed-files 审计
- 补充本地搜索与本地 AI changed-files 浏览器 smoke，并回填当前优先级 checklist

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

@@ -31,9 +31,10 @@ pub(crate) mod web_shell;
 mod ws;
 
 pub(crate) use local_folder_source::{
-    ensure_local_path_read_access, ensure_local_workspace_access, update_local_markdown_title,
-    update_local_page_options, write_local_markdown_page_body,
+    ensure_local_path_read_access, ensure_local_workspace_access, local_workspace_id_from_root_uri,
+    update_local_markdown_title, update_local_page_options, write_local_markdown_page_body,
 };
+pub(crate) use local_search_index::refresh_local_search_index_for_path;
 
 use crate::app::AppState;
 use axum::routing::{any, delete, get, post, put};