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/core-protocol/src/lib.rs

@@ -289,6 +289,13 @@ mod tests {
                 content: serde_json::json!([]),
                 revision: serde_json::json!(7),
                 conflict_detection_key: serde_json::json!("page_1:7"),
+                block_document: serde_json::json!({
+                    "documentId": "page_1",
+                    "rootBlockIds": [],
+                    "blocks": []
+                }),
+                block_projection_version: 1,
+                projection_source: "fixture".into(),
             },
             tree: page_aggregate::PageTree {
                 page_subtree: serde_json::json!({"rootNodeId": "page_1"}),

rust/crates/core-protocol/src/page_aggregate.rs

@@ -118,12 +118,28 @@ impl Default for PageOptions {
 
 #[cfg(test)]
 mod tests {
-    use super::PageOptions;
+    use super::{PageBody, PageOptions};
+    use serde_json::json;
 
     #[test]
     fn page_options_default_disables_heading_numbers() {
         assert!(!PageOptions::default().show_heading_numbers);
     }
+
+    #[test]
+    fn page_body_accepts_legacy_payload_without_block_projection() {
+        let body: PageBody = serde_json::from_value(json!({
+            "content": [],
+            "revision": 7,
+            "conflictDetectionKey": "doc_1:7"
+        }))
+        .expect("legacy page body should deserialize");
+
+        assert_eq!(body.revision, json!(7));
+        assert_eq!(body.block_projection_version, 0);
+        assert_eq!(body.block_document, json!(null));
+        assert_eq!(body.projection_source, "");
+    }
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
@@ -132,6 +148,12 @@ pub struct PageBody {
     pub content: Value,
     pub revision: Value,
     pub conflict_detection_key: Value,
+    #[serde(default)]
+    pub block_document: Value,
+    #[serde(default)]
+    pub block_projection_version: u32,
+    #[serde(default)]
+    pub projection_source: String,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]