docs(gateway): WS 帧门相关 11 个文件的注释改中文（只改注释，代码零字节改动）

主人 2026-10-03 拍板「注释一律中文」。本次先把本会话动过的文件就地翻；
不做全仓一次性翻译，存量按包分批排期（见 工作小结.md 待办）。

范围：ws_frame_scope.go / ws_frame_scope_test.go / broadcast.go / ws_hub_turn.go /
ws_hub_message_event.go / session_read.go / server.go / ws_hub_stream_scope_test.go /
history_write_broadcast_test.go / mood_test.go / extra_test.go
含中文的整行注释 18 → 382。

校验（判据 = "只改注释、零代码字节改动"）：
- `git diff -U0 | 排除 +++/--- | 排除注释行/空行/行尾注释` → 为空
- 独立实现：两侧剥掉注释后逐行比对代码文本 → 11/11 文件全等，不一致数 0
- 行尾注释 7 行逐条列出，代码列与原文逐字节相同（gofmt 未要求重排）
- gofmt -l 干净；全树 go build/vet 绿；go test ./... = 58 包 ok / 0 FAIL；
  linux/amd64 + darwin/arm64 交叉编译绿
语义未删减：部分折行英文长句合并为更少行，故整行注释数 438 → 399。

internal/services/gateway/history_write_broadcast_test.go

@@ -10,15 +10,15 @@ import (
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/history"
 )
 
-// These tests cover the D3 realtime-sync contract: a successful message edit or
-// delete must reach the account's other browsers as a WS frame, not only the client
-// that issued the REST call (otherwise every other browser has to re-read to converge).
+// 这些测试覆盖 D3 实时同步契约：一次成功的消息编辑或删除必须以
+// WS 帧到达该账号的其他浏览器，而不仅发起 REST 调用的客户端
+// （否则其他每个浏览器都得重读才能收敛）。
 
-// TestPatchMessageBroadcastsEdited covers ①: PATCH /api/v1/messages/{id} answers 200
-// and pushes exactly one `message_edited` frame scoped to the edited message's own
-// session, carrying the new content (and the mode/createdAt a client renders with).
-// The frame's data is the updated message DTO with thinking stripped, matching the
-// message_persisted contract; the REST reply keeps thinking (owner/admin-only read).
+// TestPatchMessageBroadcastsEdited 覆盖 ①：PATCH /api/v1/messages/{id}
+// 返回 200，并恰好推送一个 `message_edited` 帧，其作用域为被编辑消息
+// 自身的会话，携带新内容（以及客户端渲染所用的 mode/createdAt）。该帧
+// 的 data 是抹除了 thinking 的更新后消息 DTO，与 message_persisted
+// 契约一致；REST 回复保留 thinking（仅 owner/admin 可读）。
 func TestPatchMessageBroadcastsEdited(t *testing.T) {
 	t.Parallel()
 	ctx := context.Background()
@@ -51,7 +51,7 @@ func TestPatchMessageBroadcastsEdited(t *testing.T) {
 			if resp.StatusCode != http.StatusOK {
 				t.Fatalf("patch status = %d, want 200 (body=%s)", resp.StatusCode, body)
 			}
-			// The REST reply is the full DTO for the issuing client.
+			// REST 回复是发给发起方客户端的完整 DTO。
 			var reply historyMessage
 			if err := json.Unmarshal(decodeBody(t, body)["data"], &reply); err != nil {
 				t.Fatalf("decode reply: %v (body=%s)", err, body)
@@ -93,10 +93,9 @@ func TestPatchMessageBroadcastsEdited(t *testing.T) {
 	}
 }
 
-// TestDeleteMessageBroadcastsDeleted covers ②: DELETE /api/v1/messages/{id} answers
-// 200, really removes the row, and pushes one `message_deleted` frame carrying the id
-// plus the owning session (read before the row disappears) so a remote browser can
-// drop it without re-reading.
+// TestDeleteMessageBroadcastsDeleted 覆盖 ②：DELETE /api/v1/messages/{id}
+// 返回 200，真正删除该行，并推送一个 `message_deleted` 帧，携带 id 以及
+// 所属会话（在该行消失前读出），使远端浏览器无需重读即可移除它。
 func TestDeleteMessageBroadcastsDeleted(t *testing.T) {
 	t.Parallel()
 	ctx := context.Background()
@@ -133,7 +132,7 @@ func TestDeleteMessageBroadcastsDeleted(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	// The broadcast must not claim a delete that did not happen.
+	// 广播不得宣称一次并未发生的删除。
 	remaining, err := st.List(ctx, sub, 0, 50, "")
 	if err != nil {
 		t.Fatalf("list after delete: %v", err)
@@ -145,9 +144,9 @@ func TestDeleteMessageBroadcastsDeleted(t *testing.T) {
 	}
 }
 
-// TestDeleteMessageUnknownIDBroadcastsNothing pins the failure side: a 404 delete
-// (unknown id) must not push a `message_deleted` frame, or a client would drop a
-// message that still exists.
+// TestDeleteMessageUnknownIDBroadcastsNothing 钉住失败侧：404 的删除
+// （未知 id）不得推送 `message_deleted` 帧，否则客户端会丢掉一条仍然
+// 存在的消息。
 func TestDeleteMessageUnknownIDBroadcastsNothing(t *testing.T) {
 	t.Parallel()
 	srv, ts, jwt, _ := newHistoryEnv(t)