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/history_write.go

@@ -12,47 +12,47 @@ import (
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/history"
 )
 
-// This file owns the session/message write endpoints added for the Android
-// collaboration batch ③a: PATCH /sessions/{id} (A4 rename + D5 pin), PATCH
-// /messages/{id} (D3 edit) and DELETE /messages/{id} (D3 delete). All are owner/admin
-// history writes; the reads and DTOs live in history.go. The D3 edit/delete paths also
-// broadcast their outcome over the WS hub (message_edited / message_deleted, see
-// ws_hub.go) so the account's other browsers stay in sync without a manual re-read.
+// 本文件拥有为 Android 协作批次 ③a 新增的会话/消息写端点：
+// PATCH /sessions/{id}（A4 改名 + D5 置顶）、PATCH
+// /messages/{id}（D3 编辑）与 DELETE /messages/{id}（D3 删除）。它们都是 owner/admin
+// 历史写；读与 DTO 位于 history.go。D3 的编辑/删除路径还会
+// 经 WS hub 广播其结果（message_edited / message_deleted，见
+// ws_hub.go），使该账号的其他浏览器无需手动重读即保持同步。
 
-// patchSessionRequest is the PATCH /api/v1/sessions/{id} body. Both fields are
-// pointers so an absent field is distinguishable from an explicit zero value:
-// title renames the session (A4), pinned sets/unets the pin (D5), and at least one
-// must be present.
+// patchSessionRequest 是 PATCH /api/v1/sessions/{id} 的请求体。两个字段都是
+// 指针，因此字段缺失与显式零值可区分：title 重命名该
+// 会话（A4），pinned 设置/取消置顶（D5），且至少一个
+// 必须出现。
 //
-// personaId is deliberately NOT a settable field: a session's role is fixed when the
-// session is created (design/22 §8-1), so the key is rejected outright instead of
-// being ignored. It stays in the struct as the raw JSON so the handler can tell
-// "the key is absent" from "the key is present with any value" — `"yuki"`, `""` and
-// `null` are all refused, and only a body without the key is accepted.
+// personaId 刻意不是可设置字段：会话角色在会话创建时
+// 固定（design/22 §8-1），因此该键会被直接拒绝，而不是
+// 被忽略。它以原始 JSON 留在结构体中，使 handler 能区分
+// 「键缺失」与「键存在且为任意值」—— `"yuki"`、`""` 与
+// `null` 一律被拒，只有不含该键的请求体才被接受。
 type patchSessionRequest struct {
 	Title     *string         `json:"title"`
 	Pinned    *bool           `json:"pinned"`
 	PersonaID json.RawMessage `json:"personaId"`
 }
 
-// maxSessionTitleRunes bounds a client-supplied session title so a display row never
-// overflows. It is a display-only bound: identity and permissions never derive from
-// the title (project red line).
+// maxSessionTitleRunes 限定客户端提供的会话标题，使显示行绝不
+// 溢出。它只是显示边界：身份与权限绝不派生自
+// 标题（项目红线）。
 const maxSessionTitleRunes = 80
 
-// handlePatchSession updates a persistent session's display metadata — its title
-// (A4) and its pinned flag (D5). Both are metadata: unlike DELETE they are allowed
-// on the fixed main session. A request carrying neither field answers 400, as do an
-// empty/whitespace or over-long title and an unknown session id (404/500 as usual).
+// handlePatchSession 更新持久化会话的显示元数据 —— 其标题
+// （A4）与置顶标志（D5）。二者都是元数据：与 DELETE 不同，它们
+// 允许作用于固定的主会话。两个字段都不携带的请求返回 400，
+// 空/仅空白或过长的标题亦然，未知会话 id（照常 404/500）。
 //
-// A body carrying the personaId key answers 400 for EVERY value, and that check runs
-// before the session is looked up: a session's role is fixed at creation (design/22
-// §8-1), so switching the role of an existing conversation — including clearing it —
-// is not a supported operation; create a new session instead. Refusing explicitly
-// (rather than ignoring the key) is what keeps a client from believing a rebind
-// landed. It is owner/admin-gated like the other history writes. The response echoes
-// only the fields that were changed, so a title-only PATCH keeps its pre-D5
-// {id,title} shape.
+// 携带 personaId 键的请求体对任何取值都返回 400，且该检查
+// 在会话被查找之前执行：会话角色在创建时固定（design/22
+// §8-1），因此切换既有对话的角色 —— 包括清除它 ——
+// 不是受支持的操作；请改为新建会话。显式拒绝
+// （而不是忽略该键）正是让客户端不会误以为重绑
+// 生效的原因。它与其他历史写一样受 owner/admin 门控。响应只
+// 回显被改动的字段，因此纯标题 PATCH 保持其 D5 之前的
+// {id,title} 形状。
 func (s *Server) handlePatchSession(w http.ResponseWriter, r *http.Request) {
 	if s.history == nil {
 		writeError(w, &apperr.AppError{Code: "not_implemented", Message: "会话历史服务未配置（未注入 HistoryStore）", HTTPCode: http.StatusNotImplemented})
@@ -104,8 +104,8 @@ func (s *Server) handlePatchSession(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, http.StatusOK, resp)
 }
 
-// writeSessionPatchError maps a RenameSession/SetPinned failure to its response:
-// ErrSessionNotFound → 404, anything else → 500 (logged under op).
+// writeSessionPatchError 把 RenameSession/SetPinned 的失败映射为其响应：
+// ErrSessionNotFound → 404，其余 → 500（在 op 下记日志）。
 func (s *Server) writeSessionPatchError(w http.ResponseWriter, err error, id, op string) {
 	if errors.Is(err, history.ErrSessionNotFound) {
 		writeError(w, apperr.Wrap(apperr.ErrNotFound, "not_found", "session %q not found", id))
@@ -115,21 +115,21 @@ func (s *Server) writeSessionPatchError(w http.ResponseWriter, err error, id, op
 	writeError(w, apperr.Wrap(apperr.ErrInternal, "session_failed", "failed to update session"))
 }
 
-// patchMessageRequest is the PATCH /api/v1/messages/{id} body. Content is a pointer so
-// an absent field is rejected rather than treated as an empty edit.
+// patchMessageRequest 是 PATCH /api/v1/messages/{id} 的请求体。Content 是指针，
+// 因此字段缺失会被拒绝，而不是被当作空编辑。
 type patchMessageRequest struct {
 	Content *string `json:"content"`
 }
 
-// maxMessageContentRunes bounds an edited message body. It is a storage/display bound
-// on the edit path only; inbound chat messages are not subject to it.
+// maxMessageContentRunes 限定被编辑的消息体。它只是编辑路径上的
+// 存储/显示边界；入站聊天消息不受其约束。
 const maxMessageContentRunes = 4000
 
-// handlePatchMessage edits a single message's content (Android collaboration batch ③a,
-// D3). Only content changes — role/timestamp/platform stay as stored — and the response
-// returns the updated message so the client can upsert it by id without a re-read. An
-// empty/whitespace or over-long content answers 400, an unknown id answers 404, and a
-// missing HistoryStore answers 501. It is owner/admin-gated.
+// handlePatchMessage 编辑单条消息的内容（Android 协作批次 ③a，
+// D3）。只有 content 会变 —— role/时间戳/platform 保持已存值 —— 响应
+// 返回更新后的消息，使客户端能按 id upsert 而无需重读。
+// 空/仅空白或过长的 content 返回 400，未知 id 返回 404，
+// HistoryStore 缺失返回 501。它受 owner/admin 门控。
 func (s *Server) handlePatchMessage(w http.ResponseWriter, r *http.Request) {
 	if s.history == nil {
 		writeError(w, &apperr.AppError{Code: "not_implemented", Message: "会话历史服务未配置（未注入 HistoryStore）", HTTPCode: http.StatusNotImplemented})
@@ -168,20 +168,20 @@ func (s *Server) handlePatchMessage(w http.ResponseWriter, r *http.Request) {
 		writeError(w, apperr.Wrap(apperr.ErrInternal, "message_failed", "failed to update message"))
 		return
 	}
-	// Broadcast the edit so every other browser of the account re-renders the same
-	// bubble without a refresh (the message_persisted realtime-sync contract, D3 edit
-	// path). Thinking is stripped from the frame to match the persisted/replay
-	// contract; the REST reply keeps it because the messages routes are owner/admin-only.
+	// 广播该编辑，使该账号的其他每个浏览器无需刷新就重渲染同一个
+	// 气泡（message_persisted 实时同步契约，D3 编辑
+	// 路径）。thinking 会从帧中剥掉，以匹配持久化/重放
+	// 契约；REST 回复保留它，因为消息路由仅 owner/admin。
 	edited := toHistoryMessage(msg)
 	edited.Thinking = ""
 	s.hub.broadcastMessageEdited(edited)
 	writeJSON(w, http.StatusOK, toHistoryMessage(msg))
 }
 
-// handleDeleteMessage removes a single message (D3). An unknown id answers 404, a
-// missing HistoryStore 501. It is owner/admin-gated. A successful delete is
-// broadcast as a `message_deleted` frame so every browser of the account drops the
-// row without a refresh; the owning session is read before the row disappears.
+// handleDeleteMessage 移除单条消息（D3）。未知 id 返回 404，
+// HistoryStore 缺失返回 501。它受 owner/admin 门控。成功的删除会
+// 以 `message_deleted` 帧广播，使该账号的每个浏览器无需刷新就丢掉
+// 该行；所属会话在该行消失前被读取。
 func (s *Server) handleDeleteMessage(w http.ResponseWriter, r *http.Request) {
 	if s.history == nil {
 		writeError(w, &apperr.AppError{Code: "not_implemented", Message: "会话历史服务未配置（未注入 HistoryStore）", HTTPCode: http.StatusNotImplemented})
@@ -206,18 +206,18 @@ func (s *Server) handleDeleteMessage(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, http.StatusOK, map[string]any{"deleted": id})
 }
 
-// messageLookup is the optional narrower view of HistoryStore used by DELETE to learn
-// a message's owning session before it is removed (afterwards there is nothing left to
-// ask). *history.Store implements it; a store that does not simply yields an unscoped
-// frame, which the client resolves by the globally unique message id.
+// messageLookup 是 HistoryStore 可选的更窄视图，DELETE 用它
+// 在移除前得知消息所属的会话（之后就没有可问的了）。
+// *history.Store 实现了它；未实现的存储只是产出一个无作用域
+// 的帧，客户端凭全局唯一的消息 id 解析它。
 type messageLookup interface {
 	GetMessage(ctx context.Context, id string) (history.Message, error)
 }
 
-// messageSession returns the session id owning message id, or "" when the store cannot
-// answer (no lookup surface, unknown id, or a read error). A blank session is safe for
-// the broadcast: the message id is globally unique, so a client that falls back to an
-// id-only filter can only ever touch that message's own conversation.
+// messageSession 返回拥有 message id 的会话 id，存储无法作答时
+// 返回 ""（无查找表面、未知 id 或读错误）。空白会话
+// 对广播是安全的：消息 id 全局唯一，因此回退到
+// 纯 id 过滤的客户端只可能触及该消息自己的对话。
 func (s *Server) messageSession(ctx context.Context, id string) string {
 	lookup, ok := s.history.(messageLookup)
 	if !ok {