docs(comments): 注释中文化 · internal/runtime/model + internal/services/backthink（54 文件，纯替换）

- 只翻注释/文档字符串：`go/scanner` 剥注释后按 token 序列+literal 逐 token 比对，**54/54 文件 SAME**；
  改动文件总行数与 HEAD 漂移 = 0（严格 1:1，无合并/拆行）
- 裁决编号与 design 节号逐字保留（03.4.1/03.4.2/03.4.3/14.4.1/14.4.5/07.4.2-4、design/04 §3.1/§3.2 等）；
  `chat_template_kwargs` / `enable_thinking` / `reasoning_effort` / `thinking:{type}` 字段名与形状说明未动
- 存疑译法（已登记）：`persona` 在叙事语境用「角色」、标识符语境保留 `persona`（仓库既有模块本身混用）；
  `rung`→「级」；`provider` 存在「提供商/提供者」两种落笔（可按需一键统一）
- 复核：build/vet 绿 + 两包测试绿；gofmt 干净；残留英文注释 0 条
- 既有存量（未修，只报告）：`model/anthropic_test.go` 612 行 >500；`applyAnthropicEvent` 115 行 >80

internal/services/backthink/push_outlet_test.go

@@ -16,8 +16,8 @@ import (
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/channel/adapter"
 )
 
-// mockExporter records exported messages and can block or fail on demand so the
-// pusher hook's non-blocking / failure-tolerant behaviour is testable.
+// mockExporter 记录已导出的消息，并可按需阻塞或失败，
+// 使推送器钩子的非阻塞 / 容错行为可测。
 type mockExporter struct {
 	mu        sync.Mutex
 	msgs      []adapter.UnifiedMessage
@@ -49,9 +49,9 @@ func (m *mockExporter) messages() []adapter.UnifiedMessage {
 	return append([]adapter.UnifiedMessage(nil), m.msgs...)
 }
 
-// TestPushOutletHTTPPrimaryDelivers proves the self-hosted service is the
-// primary tier: the payload is POSTed with the bearer token and a 2xx response
-// is reported as delivered.
+// TestPushOutletHTTPPrimaryDelivers 证明自托管服务是
+// 主级：负载带着 bearer token 被 POST，2xx 响应
+// 被上报为已投递。
 func TestPushOutletHTTPPrimaryDelivers(t *testing.T) {
 	t.Parallel()
 	type payload struct {
@@ -109,14 +109,14 @@ func TestPushOutletHTTPPrimaryDelivers(t *testing.T) {
 	}
 }
 
-// TestPushOutletUnreachableLogsGetuiFallback asserts an unreachable primary is a
-// logged miss (not an error), names the pending Getui fallback, and never logs
-// the token.
+// TestPushOutletUnreachableLogsGetuiFallback 断言主级不可达是一次
+// 记账的未命中（不是错误），会点出待接入的个推降级，且绝不记录
+// token。
 func TestPushOutletUnreachableLogsGetuiFallback(t *testing.T) {
 	t.Parallel()
 	srv := httptest.NewServer(http.HandlerFunc(func(http.ResponseWriter, *http.Request) {}))
 	url := srv.URL
-	srv.Close() // now unreachable
+	srv.Close() // 此时已不可达
 
 	var buf bytes.Buffer
 	log := slog.New(slog.NewTextHandler(&buf, nil))
@@ -137,7 +137,7 @@ func TestPushOutletUnreachableLogsGetuiFallback(t *testing.T) {
 	}
 }
 
-// TestPushOutletHTTPErrorReportsMiss asserts a non-2xx primary response is a miss.
+// TestPushOutletHTTPErrorReportsMiss 断言主级非 2xx 响应算未命中。
 func TestPushOutletHTTPErrorReportsMiss(t *testing.T) {
 	t.Parallel()
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
@@ -155,8 +155,8 @@ func TestPushOutletHTTPErrorReportsMiss(t *testing.T) {
 	}
 }
 
-// TestNewPushOutletDisabledOrUnconfigured covers the two degraded shapes: the
-// hook off (nil) and enabled without a primary URL (miss + Getui note).
+// TestNewPushOutletDisabledOrUnconfigured 覆盖两种降级形态：钩子
+// 关闭（nil）与启用但无主级 URL（未命中 + 个推备注）。
 func TestNewPushOutletDisabledOrUnconfigured(t *testing.T) {
 	t.Parallel()
 	if exp := NewPushOutlet(PushOutletConfig{Enabled: false, URL: "http://example.invalid"}); exp != nil {
@@ -178,8 +178,8 @@ func TestNewPushOutletDisabledOrUnconfigured(t *testing.T) {
 	}
 }
 
-// TestPusherExportsProactiveToOutlet asserts the hook mirrors the delivered
-// proactive message to the outlet after the IM delivery.
+// TestPusherExportsProactiveToOutlet 断言钩子在 IM 投递之后
+// 把已投递的主动消息镜像到出口。
 func TestPusherExportsProactiveToOutlet(t *testing.T) {
 	t.Parallel()
 	exp := &mockExporter{delivered: true}
@@ -205,9 +205,9 @@ func TestPusherExportsProactiveToOutlet(t *testing.T) {
 	}
 }
 
-// TestPusherExportHookNonBlockingAndFailureTolerant asserts a hung/failing outlet
-// never delays the push and never turns a delivered proactive message into a
-// failure.
+// TestPusherExportHookNonBlockingAndFailureTolerant 断言挂死/失败的出口
+// 绝不延迟推送，也绝不把已投递的主动消息变成
+// 失败。
 func TestPusherExportHookNonBlockingAndFailureTolerant(t *testing.T) {
 	t.Parallel()
 	started := make(chan struct{})
@@ -238,8 +238,8 @@ func TestPusherExportHookNonBlockingAndFailureTolerant(t *testing.T) {
 	}
 }
 
-// TestPusherRateLimitedPushIsNotExported asserts a rate-limited push never
-// reaches the outlet: the hook mirrors real proactive sends only.
+// TestPusherRateLimitedPushIsNotExported 断言被限流的推送绝不
+// 到达出口：该钩子只镜像真实的主动发送。
 func TestPusherRateLimitedPushIsNotExported(t *testing.T) {
 	t.Parallel()
 	exp := &mockExporter{delivered: true}