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/flowgate_test.go

@@ -43,10 +43,10 @@ func groupOwnerMsg(i int) adapter.UnifiedMessage {
 	return m
 }
 
-// TestFlowGate_RateLimitDropsNonOwnerAndAudits verifies the gate is wired into the
-// ingress (onMessage) and that a rate-limited non-owner message is dropped with the
-// reason surfaced through the OnRejected audit hook. The dropped path is synchronous
-// (no worker goroutine is spawned), so the assertion is deterministic.
+// TestFlowGate_RateLimitDropsNonOwnerAndAudits 验证闸门已接入
+// 入口（onMessage），且被限流的非主人消息会被丢弃并经
+// OnRejected 审计钩子暴露原因。丢弃路径是同步的
+// （不会派生工作 goroutine），因此断言是确定性的。
 func TestFlowGate_RateLimitDropsNonOwnerAndAudits(t *testing.T) {
 	t.Parallel()
 
@@ -63,8 +63,8 @@ func TestFlowGate_RateLimitDropsNonOwnerAndAudits(t *testing.T) {
 	ad := &fakeAdapter{name: "kook", cfg: map[string]any{"bot_token": "x", "msgPerMin": 1}}
 	b.Add(ad)
 
-	// First message is admitted (async worker), only auditing the second, which the
-	// total per-minute cap refuses.
+	// 第一条消息被放行（异步工作项），只对第二条入审计，
+	// 它被每分钟总量上限拒绝。
 	b.onMessage(context.Background(), groupSender(0), ad)
 	b.onMessage(context.Background(), groupSender(1), ad)
 
@@ -73,9 +73,9 @@ func TestFlowGate_RateLimitDropsNonOwnerAndAudits(t *testing.T) {
 	}
 }
 
-// TestFlowGate_OwnerPrivateBypassesGate verifies owner messages bypass the flow gate
-// entirely: even with an aggressive rate limit, an owner message is never dropped as
-// rate_limited / review_pruned / capped.
+// TestFlowGate_OwnerPrivateBypassesGate 验证主人消息完全绕过流控
+// 闸门：即使限流很激进，主人消息也绝不会以
+// rate_limited / review_pruned / capped 被丢弃。
 func TestFlowGate_OwnerPrivateBypassesGate(t *testing.T) {
 	t.Parallel()
 
@@ -92,8 +92,8 @@ func TestFlowGate_OwnerPrivateBypassesGate(t *testing.T) {
 	ad := &fakeAdapter{name: "kook", cfg: map[string]any{"bot_token": "x", "groupMsgPerMin": 1, "maxMessages": 1}}
 	b.Add(ad)
 
-	// Three owner messages: if the gate applied, the 2nd and 3rd would be rate
-	// limited / capped and reach OnRejected. Owner bypass leaves the audit empty.
+	// 三条主人消息：若闸门生效，第 2、3 条会被限流
+	// / 触及上限并到达 OnRejected。主人绕过则审计为空。
 	for i := 0; i < 3; i++ {
 		b.onMessage(context.Background(), groupOwnerMsg(i), ad)
 	}
@@ -102,9 +102,9 @@ func TestFlowGate_OwnerPrivateBypassesGate(t *testing.T) {
 	}
 }
 
-// TestFlowGate_GateOptionsDefaults pins the config-to-limit resolution that keeps
-// old CHANNELS_JSON accounts backward compatible: absent key → off, 0 → protective
-// default, negative → off, positive → pinned.
+// TestFlowGate_GateOptionsDefaults 钉住「配置→限制」的解析规则，
+// 它保证旧的 CHANNELS_JSON 账号向后兼容：键缺失 → 关闭，0 → 保护性
+// 默认值，负值 → 关闭，正值 → 固定为该值。
 func TestFlowGate_GateOptionsDefaults(t *testing.T) {
 	t.Parallel()
 
@@ -139,7 +139,7 @@ func TestFlowGate_GateOptionsDefaults(t *testing.T) {
 	}
 }
 
-// mockLLM is a model.Adapter stub returning a fixed completion.
+// mockLLM 是返回固定补全的 model.Adapter 桩。
 type mockLLM struct {
 	content string
 	err     error
@@ -156,8 +156,8 @@ func (m *mockLLM) ChatStream(_ context.Context, _ model.Request, _ func(model.St
 	return model.Response{}, nil
 }
 
-// TestNewLLMReviewer verifies the review model is wrapped into a Reviewer that asks
-// the LLM which queued messages to keep and filters the returned indices.
+// TestNewLLMReviewer 验证审查模型被包装成 Reviewer：向
+// LLM 询问哪些队列消息该保留，并过滤返回的索引。
 func TestNewLLMReviewer(t *testing.T) {
 	t.Parallel()
 
@@ -173,7 +173,7 @@ func TestNewLLMReviewer(t *testing.T) {
 	if err != nil {
 		t.Fatalf("review: %v", err)
 	}
-	// Out-of-range index 99 and the duplicate 0 are dropped; keep = [0,1].
+	// 越界索引 99 与重复的 0 被丢弃；保留 = [0,1]。
 	if len(keep) != 2 || keep[0] != 0 || keep[1] != 1 {
 		t.Fatalf("keep = %v, want [0 1]", keep)
 	}
@@ -183,8 +183,8 @@ func TestNewLLMReviewer(t *testing.T) {
 	}
 }
 
-// TestNewLLMReviewerError verifies a review-model failure is surfaced to the gate,
-// which then falls back to FIFO eviction rather than fabricating a success.
+// TestNewLLMReviewerError 验证审查模型失败会暴露给闸门，
+// 闸门随后回退为 FIFO 淘汰，而不是伪造一个成功。
 func TestNewLLMReviewerError(t *testing.T) {
 	t.Parallel()