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/routes/tree.rs

@@ -6940,6 +6940,7 @@ mod tests {
             legacy_next_base_url: Some("http://127.0.0.1:3100".into()),
             enable_legacy_next_compat: true,
             enable_debug_shell_routes: true,
+            enable_editor_actor: true,
             hermes_base_path: "/api/hermes".into(),
             compat_next_base_path: "/api/compat/next".into(),
             convex_url: None,
@@ -7896,6 +7897,7 @@ mod tests {
             payload["result"]["documentId"],
             Value::String("page_child".into())
         );
+        assert_eq!(payload["result"]["sortOrder"], Value::from(1));
         assert_eq!(
             payload["result"]["execution"]["deletedCount"],
             Value::from(1)
@@ -8002,10 +8004,18 @@ mod tests {
             payload["result"]["artifacts"]["domainEvent"]["payload"]["streamDelta"]["op"],
             Value::String("move_document".into())
         );
+        assert_eq!(
+            payload["result"]["artifacts"]["domainEvent"]["payload"]["streamDelta"]["sortOrder"],
+            Value::from(1)
+        );
         assert_eq!(
             payload["result"]["artifacts"]["commandLog"]["payload"]["streamDelta"]["op"],
             Value::String("move_document".into())
         );
+        assert_eq!(
+            payload["result"]["artifacts"]["commandLog"]["payload"]["streamDelta"]["sortOrder"],
+            Value::from(1)
+        );
     }
 
     #[tokio::test]