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/ws_hub_stream_scope_test.go

@@ -13,8 +13,8 @@ import (
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/model"
 )
 
-// scopeStreamAdapter is a model.Adapter that emits two text deltas so a test can
-// drive the real loop and observe the framed events it produces.
+// scopeStreamAdapter 是一个 model.Adapter，发出两个文本增量，使测试
+// 能驱动真实 loop 并观察它产出的成帧事件。
 type scopeStreamAdapter struct{}
 
 func (scopeStreamAdapter) Name() string { return "scope-test" }
@@ -31,10 +31,10 @@ func (scopeStreamAdapter) ChatStream(_ context.Context, _ model.Request, on func
 	return model.Response{Content: "Hel lo"}, nil
 }
 
-// newScopedStreamHub wires a hub to a real loop whose OnStream closure mirrors
-// cmd/cyrene's streamChunk (publish the whole StreamEvent value to ws.stream), so
-// a test exercises the production path OnStream → bus → relay → frame. It returns
-// the hub and a registered fake connection.
+// newScopedStreamHub 把 hub 接到真实 loop，其 OnStream 闭包与
+// cmd/cyrene 的 streamChunk 一致（把整个 StreamEvent 值发布到
+// ws.stream），因此测试走的是生产路径 OnStream → bus → relay → frame。
+// 它返回 hub 与一个已注册的假连接。
 func newScopedStreamHub(t *testing.T) (*hub, *wsConn) {
 	t.Helper()
 	b := bus.New()
@@ -58,10 +58,9 @@ func newScopedStreamHub(t *testing.T) (*hub, *wsConn) {
 	return hb, c
 }
 
-// readDeltas scans the connection's frames until want message.delta frames have
-// arrived. The deltas reach the conn asynchronously through the bus while
-// runTurn's own stream_end is sent straight to the conn, so a test cannot assume
-// an order.
+// readDeltas 扫描连接的帧，直到 want 个 message.delta 帧到达。增量经
+// bus 异步到达该连接，而 runTurn 自己的 stream_end 是直接发给连接
+// 的，因此测试不能假定顺序。
 func readDeltas(t *testing.T, c *wsConn, want int) []wsEvent {
 	t.Helper()
 	var deltas []wsEvent
@@ -83,11 +82,11 @@ func readDeltas(t *testing.T, c *wsConn, want int) []wsEvent {
 	return deltas
 }
 
-// TestStreamFramesCarrySessionScope is the end-to-end lock for A1: a turn driven
-// through the hub's runTurn must surface message.delta frames that carry the
-// session and the turn id, so a client can route them to the active session. It
-// runs the real loop instead of calling broadcastStream directly, which also
-// proves the bus carries the new fields untouched — no publisher change needed.
+// TestStreamFramesCarrySessionScope 是 A1 的端到端锁定：经 hub 的
+// runTurn 驱动的一轮必须发出携带会话与轮次 id 的 message.delta 帧，
+// 使客户端能把它们路由到活跃会话。它跑真实 loop 而不是直接调用
+// broadcastStream，这同时证明 bus 原样携带了新字段 —— 无需改动
+// 发布方。
 func TestStreamFramesCarrySessionScope(t *testing.T) {
 	t.Parallel()
 	hb, c := newScopedStreamHub(t)
@@ -116,10 +115,9 @@ func TestStreamFramesCarrySessionScope(t *testing.T) {
 	}
 }
 
-// TestStreamFramesTurnScopeChangesPerTurn covers the orchestrated resume shape: a
-// pending turn drained after the first one completes is a second runTurn call, so
-// it must take a fresh turnId. Without that, deltas from the resumed turn would
-// be indistinguishable from the previous turn's.
+// TestStreamFramesTurnScopeChangesPerTurn 覆盖编排下的续跑形态：在
+// 首轮完成之后被排空的待处理轮次是第二次 runTurn 调用，因此它必须
+// 取新的 turnId。否则续跑轮次的增量与上一轮的将无法区分。
 func TestStreamFramesTurnScopeChangesPerTurn(t *testing.T) {
 	t.Parallel()
 	hb, c := newScopedStreamHub(t)