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/observability.go

@@ -11,29 +11,29 @@ import (
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/trace"
 )
 
-// Default list limits shared by the trace/audit endpoints. Compile-time constants
-// so no magic number appears in the run path (project rule §10).
+// trace/audit 端点共享的默认列表上限。编译期常量，
+// 因此运行路径中不出现魔法数字（项目规范 §10）。
 const (
 	defaultObsLimit = 50
 	maxObsLimit     = 500
 )
 
-// observability bundles the gateway's live admin instrumentation: the request
-// metrics counter, the trace span ring buffer, the audit store and the
-// process-wide log ring buffer. It is built in New and is safe for concurrent
-// use.
+// observability 打包网关的实时管理仪表：请求
+// 指标计数器、trace span 环形缓冲、审计存储与
+// 进程级日志环形缓冲。它在 New 中构建，且对并发
+// 使用安全。
 type observability struct {
 	metrics  *MetricsCollector
 	traceBuf *RingBuffer
 	audit    AuditStore
-	// logBuf is the logger's log ring buffer behind the admin log-tail endpoint.
-	// The composition root injects it via SetLogBuffer once the gateway exists;
-	// until then the endpoint answers 501 rather than an empty-but-fake tail.
+	// logBuf 是管理日志尾部端点背后的 logger 日志环形缓冲。
+	// 组合根在网关存在后经 SetLogBuffer 注入它；在那之前
+	// 该端点返回 501，而不是空但虚假的尾部。
 	logBuf atomic.Pointer[logger.RingBuffer]
 }
 
-// newObservability builds the instrumentation, falling back to an in-memory audit
-// store when no store is injected.
+// newObservability 构建仪表，未注入存储时回退到内存审计
+// 存储。
 func newObservability(deps Deps) *observability {
 	obs := &observability{
 		metrics:  newMetricsCollector(),
@@ -47,10 +47,10 @@ func newObservability(deps Deps) *observability {
 	return obs
 }
 
-// ObserveSpan feeds a completed trace span into the gateway's ring buffer and the
-// LLM/subagent metric counters. It is the gateway's trace injection point: the
-// composition root wires the loop tracer here (e.g. through TraceSink) so the
-// admin panel can query spans without the gateway touching wire.go.
+// ObserveSpan 把一个已完成的 trace span 送入网关的环形缓冲与
+// LLM/子代理指标计数器。它是网关的 trace 注入点：
+// 组合根把 loop tracer 接到这里（例如通过 TraceSink），使
+// 管理面板能查询 span 而网关无需触碰 wire.go。
 func (s *Server) ObserveSpan(rec trace.SpanRecord) {
 	if s.obs == nil {
 		return
@@ -59,10 +59,10 @@ func (s *Server) ObserveSpan(rec trace.SpanRecord) {
 	s.obs.metrics.Observe(rec)
 }
 
-// TraceSink returns a trace.Writer that appends completed spans to the gateway's
-// trace ring buffer. Combine it with the existing JSONRecorder in the composition
-// root (e.g. trace.New(MultiTraceWriter{...})) so spans both hit stderr and the
-// admin panel.
+// TraceSink 返回一个 trace.Writer，把已完成的 span 追加进网关的
+// trace 环形缓冲。在组合根把它与既有的 JSONRecorder 结合
+// （例如 trace.New(MultiTraceWriter{...})），使 span 既落 stderr 又进
+// 管理面板。
 func (s *Server) TraceSink() trace.Writer {
 	if s.obs == nil {
 		return nil
@@ -70,7 +70,7 @@ func (s *Server) TraceSink() trace.Writer {
 	return traceSink{s.obs.traceBuf}
 }
 
-// recordMetric counts one request for the observability panel.
+// recordMetric 为可观测面板计一次请求。
 func (s *Server) recordMetric(method, path string, status int, durMs int64) {
 	if s.obs == nil {
 		return
@@ -78,7 +78,7 @@ func (s *Server) recordMetric(method, path string, status int, durMs int64) {
 	s.obs.metrics.Record(method, path, status, durMs)
 }
 
-// adminObservabilityMetrics returns the current gateway metrics (admin read).
+// adminObservabilityMetrics 返回当前网关指标（管理读）。
 func (s *Server) adminObservabilityMetrics(w http.ResponseWriter, r *http.Request) {
 	if s.obs == nil {
 		writeJSON(w, http.StatusOK, AdminMetrics{
@@ -89,7 +89,7 @@ func (s *Server) adminObservabilityMetrics(w http.ResponseWriter, r *http.Reques
 	writeJSON(w, http.StatusOK, s.obs.metrics.Snapshot(time.Now()))
 }
 
-// adminObservabilityTrace returns the most recent traced spans (admin read).
+// adminObservabilityTrace 返回最近的已追踪 span（管理读）。
 func (s *Server) adminObservabilityTrace(w http.ResponseWriter, r *http.Request) {
 	if s.obs == nil {
 		writeJSON(w, http.StatusOK, []AdminTraceSpan{})
@@ -103,7 +103,7 @@ func (s *Server) adminObservabilityTrace(w http.ResponseWriter, r *http.Request)
 	writeJSON(w, http.StatusOK, out)
 }
 
-// adminObservabilityAudit returns the most recent audit entries (admin read).
+// adminObservabilityAudit 返回最近的审计条目（管理读）。
 func (s *Server) adminObservabilityAudit(w http.ResponseWriter, r *http.Request) {
 	if s.obs == nil || s.obs.audit == nil {
 		writeJSON(w, http.StatusOK, []AuditRecord{})
@@ -118,8 +118,8 @@ func (s *Server) adminObservabilityAudit(w http.ResponseWriter, r *http.Request)
 	writeJSON(w, http.StatusOK, records)
 }
 
-// parseLimit parses the ?limit= query param, clamping to [1, maxObsLimit], and
-// selects defaultObsLimit when absent or invalid.
+// parseLimit 解析 ?limit= 查询参数，夹取到 [1, maxObsLimit]，
+// 缺失或非法时选用 defaultObsLimit。
 func parseLimit(r *http.Request) int {
 	n, err := strconv.Atoi(r.URL.Query().Get("limit"))
 	if err != nil || n <= 0 {