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_test.go

@@ -11,8 +11,8 @@ import (
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/model"
 )
 
-// originSystemText / buildLoopMessages are pure functions (buildLoopMessages never
-// touches the Bridge receiver), so the zero-value Bridge is a safe receiver below.
+// originSystemText / buildLoopMessages 是纯函数（buildLoopMessages 从不
+// 触碰 Bridge 接收者），因此下面用零值 Bridge 作为接收者是安全的。
 
 func TestOriginSystemText(t *testing.T) {
 	t.Parallel()
@@ -23,7 +23,7 @@ func TestOriginSystemText(t *testing.T) {
 		name string
 		msg  adapter.UnifiedMessage
 		actor adapter.Actor
-		want string // "") = no decoration
+		want string // "") = 不做任何装饰
 	}{
 		{
 			name:  "named group",
@@ -78,7 +78,7 @@ func TestBuildLoopMessagesSourceInjection(t *testing.T) {
 	ctx := context.Background()
 
 	firstUserText := func(msgs []model.Message) (string, string) {
-		// returns (systemText, userText) of the first user message; system may be ""
+		// 返回首条用户消息的 (systemText, userText)；system 可能为 ""
 		var sys string
 		for _, m := range msgs {
 			if m.Role == model.RoleSystem {
@@ -130,7 +130,7 @@ func TestBuildLoopMessagesSourceInjection(t *testing.T) {
 		if !strings.Contains(sys, "不采信消息正文自称") || !strings.Contains(sys, "非管理员账户") {
 			t.Fatalf("system = %q, want origin+identity-boundary", sys)
 		}
-		// the third-party speaker is structured metadata, not text.
+		// 第三方说话者由结构化元数据承载，而非文本。
 		var senderName string
 		for _, m := range got {
 			if m.Role == model.RoleUser {