feat: EditorRuntimeActor - 三层缓存/delta/事件架构

Phase A — EditorRuntimeActor 内存缓存层
- 新增 editor_actor.rs: EditorBlockDocument 内存态 + apply_command + load_or_init
- block.rs 四个写工具（replace/insert/delete/move）接入 actor 路径
- editor_actor feature flag（MNOTE_WEB_ENABLE_EDITOR_ACTOR=true 默认开启）
- bridge-runtime 三个核心函数公开化
- rust-toolchain: 1.89 → stable（修复 spike WASM 编译阻塞）

Phase B — 编辑器增量 delta channel
- BlockDelta/DeltaOperation 类型 + actor.build_block_delta()
- leptos-tiptap spike: mnote:editor:block-delta CustomEvent 监听 + JSON patch
- DocumentAiAgentPanel: 拦截 blockDelta → window dispatchEvent
- 工具响应含 blockDelta 字段供前端消费

Phase C — 事件 stream delta
- broadcast channel 在 AppState/actor/SSE 三层贯通
- tree_events SSE 端点发 block.delta 事件
- 旧客户端降级兼容

环境修复
- rustc recursion_limit = 1024（修复 Leptos SSR 类型深度溢出）
- run-convex-deploy.js（封装 Convex function 部署到本地后端 3210）

ref: design/07-ai/process/7-13-page-block-editor-runtime-actor-v1.md

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

@@ -1,3 +1,4 @@
+use crate::editor_actor::EditorRuntimeActor;
 use crate::local_folder_watcher_registry::LocalFolderWatcherRegistry;
 use crate::middleware::request_context::inject_request_context;
 use crate::routes::build_router;
@@ -16,6 +17,7 @@ pub struct AppConfig {
     pub legacy_next_base_url: Option<String>,
     pub enable_legacy_next_compat: bool,
     pub enable_debug_shell_routes: bool,
+    pub enable_editor_actor: bool,
     pub hermes_base_path: String,
     pub compat_next_base_path: String,
     pub convex_url: Option<String>,
@@ -48,6 +50,7 @@ impl AppConfig {
                 .ok()
                 .map(|value| matches!(value.trim(), "1" | "true" | "TRUE" | "yes" | "YES"))
                 .unwrap_or(false),
+            enable_editor_actor: env_bool("MNOTE_WEB_ENABLE_EDITOR_ACTOR", true),
             hermes_base_path: env::var("MNOTE_WEB_HERMES_BASE_PATH")
                 .unwrap_or_else(|_| "/api/hermes".into()),
             compat_next_base_path: env::var("MNOTE_WEB_COMPAT_NEXT_BASE_PATH")
@@ -130,17 +133,26 @@ fn read_env_or_dotenv(key: &str) -> Option<String> {
     None
 }
 
+use tokio::sync::broadcast;
+
 #[derive(Debug, Clone)]
 pub struct AppState {
     config: Arc<AppConfig>,
     local_folder_watcher_registry: LocalFolderWatcherRegistry,
+    pub editor_actor: EditorRuntimeActor,
+    pub block_delta_tx: broadcast::Sender<serde_json::Value>,
 }
 
 impl AppState {
     pub fn new(config: AppConfig) -> Self {
+        let (block_delta_tx, _) = broadcast::channel(256);
+        let actor = EditorRuntimeActor::new();
+        actor.set_block_delta_tx(block_delta_tx.clone());
         Self {
             config: Arc::new(config),
             local_folder_watcher_registry: LocalFolderWatcherRegistry::new(),
+            editor_actor: actor,
+            block_delta_tx,
         }
     }