docs(comments): 注释中文化 · internal/services/channelbridge（纯替换）

- 只翻注释/文档字符串：剥掉注释后代码行逐字节不变（机械校验只剩允许的行尾注释形态）
- 术语对齐既有译法（owner→主人、persona→角色、engage→参与度判定、quiet hours→安静时段、backoff→退避）
- 复核：go build 绿 + channelbridge 包测试绿；gofmt 干净

internal/services/channelbridge/source.go

@@ -6,22 +6,22 @@ import (
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/channel/adapter"
 )
 
-// This file builds the conversation-origin context injected as a SYSTEM message so
-// the model can see which platform and conversation a message came from, WITHOUT
-// polluting the user's free-text channel (design/16 §4.6.1). Origin is metadata, so
-// it is carried as a system context line and the per-message sender is carried as the
-// structured model.Message.SenderName field — never as a natural-language tag
-// concatenated into the user text, which would be both ambiguous and a prompt-injection
-// surface (a malicious member could forge tags that look like system markup).
+// 本文件构建会话来源上下文，以 SYSTEM 消息注入，
+// 让模型能看到消息来自哪个平台、哪个会话，同时不污染
+// 用户的自由文本通道（design/16 §4.6.1）。来源属于元数据，因此
+// 它由一行系统上下文承载，而每条消息的发送者由
+// 结构化的 model.Message.SenderName 字段承载——绝不做成
+// 拼进用户文本的自然语言标签，那样既含糊，又构成提示词注入
+// 面（恶意群成员可以伪造看似系统标记的标签）。
 //
-// Identity and permission are still decided structurally by the session/actor layer
-// (a project red line); this line only decorates the context and tells the model to
-// trust structure over anything in the message body.
+// 身份与权限仍由会话/actor 层结构化判定
+// （项目红线）；这一行只装饰上下文，并告知模型
+// 要相信结构，而非消息正文里的任何内容。
 
-// originSystemText returns a system context line describing the conversation origin
-// (platform + group/private) and the identity-trust rule, or "" for a pure Web main
-// session message (left undecorated to avoid noise). The conversation is constant for
-// a session, so the line is injected once per turn, not once per message.
+// originSystemText 返回描述会话来源的系统上下文行
+// （平台 + 群聊/私聊）与身份信任规则；纯 Web 主会话消息返回 ""
+// （不加装饰以免噪声）。会话在一次会话内是恒定的，
+// 因此该行每轮注入一次，而不是每条消息注入一次。
 func originSystemText(msg adapter.UnifiedMessage, actor adapter.Actor) string {
 	platform := msg.Platform
 	if platform == "" || platform == "web" {
@@ -34,9 +34,9 @@ func originSystemText(msg adapter.UnifiedMessage, actor adapter.Actor) string {
 	)
 }
 
-// originConvo names the conversation in the origin line: a group becomes
-// "群「名称」" (or "群#<id>"), and a private chat becomes "私聊". The owner's private
-// chat is left "私聊" without a name (the owner is never labeled, design/16 §4.6).
+// originConvo 在来源行里为会话命名：群聊成为
+// "群「名称」"（或 "群#<id>"），私聊则成为 "私聊"。主人的私聊
+// 保持 "私聊" 不带名称（主人从不被标注，design/16 §4.6）。
 func originConvo(msg adapter.UnifiedMessage, actor adapter.Actor) string {
 	if msg.IsGroup() {
 		return groupLabel(msg)
@@ -44,9 +44,9 @@ func originConvo(msg adapter.UnifiedMessage, actor adapter.Actor) string {
 	return "私聊"
 }
 
-// groupLabel builds the "群「名称」" / "群#<id>" label for a group conversation. A named
-// group carries its display name; an unnamed one falls back to the group id and then
-// the channel id (a GROUP-BROADCAST channel is identified by its channel id).
+// groupLabel 为群聊构建 "群「名称」" / "群#<id>" 标签。有名称的
+// 群带显示名称；无名称的依次回退到群 id、再到
+// 渠道 id（GROUP-BROADCAST 渠道以其渠道 id 标识）。
 func groupLabel(msg adapter.UnifiedMessage) string {
 	if msg.GroupName != "" {
 		return "群「" + msg.GroupName + "」"