feat: 接入 mnote web tree shell 与主页链路整理

- 增加 mnote-web tree/command 支持与前端 MnoteWebTreeShell 集成
- 调整 sidebar、documents、runtime config 与 dev/prod server 配套逻辑
- 补充 homepage/tree shell smoke 脚本并更新 harness 进度文件

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

@@ -1,10 +1,12 @@
 mod bridge;
+mod command_support;
 mod compat;
 mod health;
 mod hermes;
 mod kernel;
 mod query_support;
 mod sse;
+mod tree;
 mod ws;
 
 use crate::app::AppState;
@@ -17,6 +19,7 @@ pub fn build_router(state: AppState) -> Router {
 
     Router::new()
         .route("/health", get(health::health))
+        .route("/tree", get(tree::tree_shell))
         .route(
             "/api/kernel/projections/sidebar",
             get(kernel::project_sidebar),
@@ -24,6 +27,7 @@ pub fn build_router(state: AppState) -> Router {
         .route("/api/kernel/subtree", get(kernel::subtree))
         .route("/api/kernel/edges", get(kernel::edges))
         .route("/api/kernel/graph", get(kernel::graph))
+        .route("/api/tree/commands", post(tree::tree_command))
         .route("/api/bridge/workspace", get(bridge::workspace))
         .route("/api/bridge/request", get(bridge::request))
         .route("/api/bridge/trace", get(bridge::trace))