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/stream_support.rs

@@ -1034,6 +1034,51 @@ mod tests {
         );
     }
 
+    #[test]
+    fn stream_change_preserves_remove_asset_delta_fields() {
+        let overview = json!({
+            "command_logs": [
+                {
+                    "id": "clog_2",
+                    "command_id": "cmd_2",
+                    "created_at": "2026-04-25T10:00:02Z",
+                    "command_name": "tree.resource.delete",
+                    "payload": {
+                        "streamDelta": {
+                            "op": "remove_asset",
+                            "assetId": "asset_1",
+                            "documentId": "doc_target",
+                            "updatedAt": "2026-04-25T10:00:02Z"
+                        }
+                    }
+                },
+                {
+                    "id": "clog_1",
+                    "command_id": "cmd_1",
+                    "created_at": "2026-04-25T10:00:01Z"
+                }
+            ],
+            "domain_events": []
+        });
+
+        let change = resolve_stream_change(
+            &overview,
+            Some(r#"{"createdAt":"2026-04-25T10:00:01Z","id":"clog_1"}"#),
+        )
+        .expect("应识别到变化");
+
+        assert_eq!(change.kind, StreamChangeKind::Delta);
+        assert_eq!(
+            change.delta,
+            Some(json!({
+                "op": "remove_asset",
+                "assetId": "asset_1",
+                "documentId": "doc_target",
+                "updatedAt": "2026-04-25T10:00:02Z"
+            }))
+        );
+    }
+
     #[test]
     fn stream_change_detects_noop_delta_for_non_tree_mutating_command() {
         let overview = json!({
@@ -1395,5 +1440,9 @@ mod tests {
                 { "id": "asset_1" }
             ]
         })));
+        assert!(delta_requires_projection_snapshot(&json!({
+            "op": "remove_asset",
+            "assetId": "asset_1"
+        })));
     }
 }