feat: stabilize page AI ACP runtimes

实现并稳定页面 AI 的 ACP Hermes / ACP Reasonix 运行路径。

主要内容：

- 分离 profile 与 acpRuntime，ACP Hermes 按所选 Hermes profile 启动并注入 provider key。

- 修复 Reasonix ACP wrapper 的 API key 读取、ToolRegistry 注册、LoopEvent role 映射和 reasoning/final 分流。

- 修复 ACP agent_thought_chunk 被 untagged enum 误解析为 message.delta 的问题，补充 thought 相关单测。

- 补充页面 AI 浏览器验证 skill 证据到 7-15 设计稿，并记录严格验收标准。

- 同步提交当前仓库中已存在的 rust-web / Hermes tools / SSE / bug 文档相关改动。

验证：

- node --check scripts/reasonix-acp-wrapper.mjs

- cargo test -p mnote-web acp -- --nocapture

- 页面 AI ACP 浏览器验证：tmp/page-ai-acp-browser-UAYwyM/

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

@@ -80,10 +80,7 @@ async fn events_with_stream_delta(
             if let Some(ref mut rx) = state.block_delta_rx {
                 match rx.try_recv() {
                     Ok(payload) => {
-                        return Some((
-                            Ok(stream_event("block.delta", &payload)),
-                            Some(state),
-                        ));
+                        return Some((Ok(stream_event("block.delta", &payload)), Some(state)));
                     }
                     Err(tokio::sync::broadcast::error::TryRecvError::Empty) => {}
                     Err(tokio::sync::broadcast::error::TryRecvError::Closed) => {
@@ -106,10 +103,7 @@ async fn events_with_stream_delta(
                             "requestId": payload.get("requestId"),
                             "traceId": payload.get("traceId"),
                         });
-                        return Some((
-                            Ok(stream_event("delta", &hint)),
-                            Some(state),
-                        ));
+                        return Some((Ok(stream_event("delta", &hint)), Some(state)));
                     }
                     Err(tokio::sync::broadcast::error::TryRecvError::Empty) => {}
                     Err(tokio::sync::broadcast::error::TryRecvError::Closed) => {
@@ -139,10 +133,7 @@ async fn events_with_stream_delta(
                 if let Some(ref mut rx) = state.block_delta_rx {
                     match rx.try_recv() {
                         Ok(payload) => {
-                            return Some((
-                                Ok(stream_event("block.delta", &payload)),
-                                Some(state),
-                            ));
+                            return Some((Ok(stream_event("block.delta", &payload)), Some(state)));
                         }
                         Err(tokio::sync::broadcast::error::TryRecvError::Empty) => {}
                         Err(tokio::sync::broadcast::error::TryRecvError::Closed) => {
@@ -237,7 +228,14 @@ pub async fn tree_events(
     }
     let block_delta_rx = state.block_delta_tx.subscribe();
     let stream_delta_rx = state.stream_delta_tx.subscribe();
-    let sse = events_with_stream_delta(state, context, query, Some(block_delta_rx), Some(stream_delta_rx)).await?;
+    let sse = events_with_stream_delta(
+        state,
+        context,
+        query,
+        Some(block_delta_rx),
+        Some(stream_delta_rx),
+    )
+    .await?;
     Ok((headers, sse))
 }