feat: advance local-first conflict and search indexing

- 补齐本地 markdown 冲突处理与合并写回路径\n- 增加本地搜索索引路由、刷新与 browser smoke\n- 同步更新 current-priority checklist 的阶段进度

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

@@ -13,6 +13,7 @@ mod kernel;
 mod local_folder_events;
 mod local_folder_source;
 mod local_markdown_parser;
+mod local_search_index;
 mod media;
 mod mindmap_api;
 mod mindmap_shell;
@@ -89,6 +90,18 @@ pub fn build_router(state: AppState) -> Router {
             get(web_shell::editor_image_placeholder_asset),
         )
         .route("/api/search/documents", post(search::documents))
+        .route(
+            "/api/search/local-index/refresh",
+            post(search::refresh_local_index),
+        )
+        .route(
+            "/api/search/local-index/backlinks",
+            get(search::local_index_backlinks),
+        )
+        .route(
+            "/api/search/local-index/tags",
+            get(search::local_index_tags),
+        )
         .route("/api/gateway/health", get(gateway::gateway_health))
         .route("/api/dev/hot-reload", get(dev_hot::hot_reload))
         .route("/api/runtime/config", get(session::runtime_config))