docs(gateway): gateway 剩余文件注释改中文（逐行 1:1，代码零字节改动）

主人 2026-10-03 拍板「注释一律中文」；gateway 至此整包注释中文化完成（本会话共 3 批：
已推库 16 个文件 + 本批剩余文件）。
校验：机械校验（非注释改动行）= 空；剥注释后代码文本逐行比对全等（不一致文件数 0）；
全树 go test ./... 58 包 ok / 0 FAIL；交叉编译绿。

internal/services/gateway/session_persist.go

@@ -8,18 +8,18 @@ import (
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/model"
 )
 
-// This file owns the orchestrator's chat-history persistence hooks (design/16
-// §3.3): the user stream is written at submit time and the assistant reply when a
-// turn settles. Both are silent no-ops when no history store is wired, so the
-// orchestrator runs unchanged without a store (tests / an unwired gateway).
+// 本文件拥有编排器的聊天历史持久化钩子（design/16
+// §3.3）：用户消息流在提交时写入，助手回复在
+// 回合结算时写入。未接线 history 存储时二者都是静默空操作，
+// 因此编排器无存储也能原样运行（测试 / 未接线的网关）。
 
-// modeChat is the behavior mode persisted when a turn carries none (design/01 §3,
-// design/16 §5.1). It is also the only mode the IM paths ever write, because IM
-// carries chat text alone.
+// modeChat 是回合未携带行为模式时所持久化的模式（design/01 §3，
+// design/16 §5.1）。它也是 IM 路径唯一会写入的模式，因为 IM
+// 只携带聊天文本。
 const modeChat = "chat"
 
-// modeOrDefault returns mode, or modeChat when the caller supplied none, so a
-// persisted message never carries an empty behavior mode (design/16 §5.1).
+// modeOrDefault 返回 mode，调用方未提供时返回 modeChat，使
+// 持久化消息绝不携带空的行为模式（design/16 §5.1）。
 func modeOrDefault(mode string) string {
 	if mode == "" {
 		return modeChat
@@ -27,34 +27,34 @@ func modeOrDefault(mode string) string {
 	return mode
 }
 
-// messageModeContextKey is the context key carrying a turn's behavior mode
-// (design/01 §3, design/16 §5.1) from the HTTP/WS boundary into the orchestrator's
-// persistence, so each persisted message is tagged with the mode it was sent in.
+// messageModeContextKey 是携带回合行为模式的 context 键
+// （design/01 §3、design/16 §5.1），从 HTTP/WS 边界引入编排器的
+// 持久化，使每条持久化消息被它发送时的模式标注。
 type messageModeContextKey struct{}
 
-// withMode returns a context carrying mode so the orchestrator can tag the
-// persisted user message and assistant reply. An empty mode is a no-op (the
-// persistence layer falls back to modeChat).
+// withMode 返回携带 mode 的 context，使编排器能标注
+// 持久化的用户消息与助手回复。空 mode 是空操作
+// （持久化层回退到 modeChat）。
 func withMode(ctx context.Context, mode string) context.Context {
 	return context.WithValue(ctx, messageModeContextKey{}, mode)
 }
 
-// modeFrom returns the behavior mode carried by ctx, or "" when none was set.
+// modeFrom 返回 ctx 携带的行为模式，未设置时返回 ""。
 func modeFrom(ctx context.Context) string {
 	v, _ := ctx.Value(messageModeContextKey{}).(string)
 	return v
 }
 
-// persistUserMessages writes each RoleUser message of a submitted turn to the
-// history store so the raw user stream is durable before the turn resolves, then
-// notifies the transport so every browser of the same account can append it
-// without a manual refresh (design/16 §3.3, §4.2). deviceID tags the message with
-// the sending client (design/16 §4.5), mode is the behavior mode the turn was
-// sent in (design/16 §5.1), falling back to modeChat when empty, and personaID is
-// the role the turn speaks as (design/22 §7-5) — the role of the moment, so a
-// session that later switches roles keeps an accurate "who said this" stream. It
-// is a no-op when no history store is wired. Rejected turns (empty, pending-full)
-// never reach it, so nothing vacuous is persisted.
+// persistUserMessages 把一次已提交回合中每条 RoleUser 消息写入
+// 历史存储，使原始用户消息流在回合结算前就持久，随后
+// 通知传输层，使同一账号的每个浏览器都能追加它
+// 而无需手动刷新（design/16 §3.3、§4.2）。deviceID 用发送客户端标注
+// 消息（design/16 §4.5），mode 是该回合发送时的行为模式
+// （design/16 §5.1），为空时回退到 modeChat，而 personaID 是
+// 该回合说话时的角色（design/22 §7-5）—— 即当时的角色，因此
+// 之后切换角色的会话仍保有准确的「谁说了这个」流。未接线
+// history 存储时它是空操作。被拒绝的回合（空、待处理已满）
+// 绝不触达它，因此不会持久化任何空内容。
 func (o *Orchestrator) persistUserMessages(ctx context.Context, sessionID string, messages []model.Message, deviceID, mode, personaID string) {
 	if o.history == nil {
 		return
@@ -76,17 +76,17 @@ func (o *Orchestrator) persistUserMessages(ctx context.Context, sessionID string
 	}
 }
 
-// persistAssistantReply writes the final assistant text of a settled turn to the
-// history store, then notifies the transport (design/16 §3.3, §4.2). deviceID tags
-// the reply with the client that sent the turn (design/16 §4.5), mode is the
-// behavior mode of that turn (design/16 §5.1), falling back to modeChat when
-// empty, and personaID is the role that produced the reply (design/22 §7-5). Mood
-// is the persona's mood for that turn (design/01 §2 情绪状态机), taken off the loop
-// result, so the stored/DTO/`message_persisted` mood is real data rather than a
-// permanently empty column; a turn with no mood tracking stores an empty mood. It
-// is a no-op when no history store is wired or the turn produced no text
-// (interrupted/errored turns leave res nil). The write runs under a fresh
-// background context so a canceled turn context never aborts it.
+// persistAssistantReply 把已结算回合的最终助手文本写入
+// 历史存储，然后通知传输层（design/16 §3.3、§4.2）。deviceID 用
+// 发送该回合的客户端标注回复（design/16 §4.5），mode 是
+// 该回合的行为模式（design/16 §5.1），为空时回退到 modeChat，
+// 而 personaID 是产出该回复的角色（design/22 §7-5）。Mood
+// 是该回合中人格的 mood（design/01 §2 情绪状态机），取自 loop
+// 结果，因此已存/DTO/`message_persisted` 的 mood 是真实数据，而不是
+// 永远为空的列；不跟踪 mood 的回合存一个空 mood。它
+// 在未接线 history 存储，或该回合没有产出文本
+// 时是空操作（被中断/出错的回合保持 res 为 nil）。该写入在一个全新的
+// 后台 context 下运行，因此被取消的回合 context 绝不可能中断它。
 func (o *Orchestrator) persistAssistantReply(sessionID string, res *loop.Result, deviceID, mode, personaID string) {
 	if o.history == nil || res == nil || res.Text == "" {
 		return
@@ -99,8 +99,8 @@ func (o *Orchestrator) persistAssistantReply(sessionID string, res *loop.Result,
 	o.notifyPersisted(full)
 }
 
-// messageTextImage returns the concatenated text and the first image URL of a
-// message's content parts, for persistence into the chat_messages columns.
+// messageTextImage 返回消息内容部分拼接后的文本与首个图片
+// URL，供持久化进 chat_messages 各列。
 func messageTextImage(m model.Message) (text, image string) {
 	for _, c := range m.Content {
 		if c.Type == model.ContentTypeText {