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_logs_test.go

@@ -12,13 +12,13 @@ import (
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/logger"
 )
 
-// logEnvelope decodes the {data:[...]} envelope of the log-tail endpoint.
+// logEnvelope 解码日志尾部端点的 {data:[...]} 信封。
 type logEnvelope struct {
 	Data []AdminLogEntry `json:"data"`
 }
 
-// logsServer builds a gateway with an injected log ring buffer already fed by a
-// real logger, so the endpoint is exercised against the production capture path.
+// logsServer 构建一个网关，注入了已由真实 logger 喂入的日志
+// 环形缓冲，因此该端点是针对生产捕获路径演练的。
 func logsServer(t *testing.T) (*Server, string, string) {
 	t.Helper()
 	srv, ts, jwt := buildEnv(t, cfgDefault(), Deps{})
@@ -74,7 +74,7 @@ func TestAdminObservabilityLogs_LevelFilter(t *testing.T) {
 		{"info", []string{"error", "warn", "info"}},
 		{"warn", []string{"error", "warn"}},
 		{"error", []string{"error"}},
-		{"ERROR", []string{"error"}}, // case-insensitive
+		{"ERROR", []string{"error"}}, // 大小写不敏感
 		{"", []string{"error", "warn", "info"}},
 	}
 	for _, tc := range cases {
@@ -133,7 +133,7 @@ func TestAdminObservabilityLogs_LimitClamped(t *testing.T) {
 		t.Fatalf("limit=2 data = %+v, want the two newest", env.Data)
 	}
 
-	// An invalid/absent limit falls back to the default (all 3 here < 200).
+	// 非法/缺失的 limit 回退到默认值（这里全部 3 条 < 200）。
 	resp, body = doReq(t, http.MethodGet, base+"/api/v1/admin/observability/logs?limit=abc", nil, tok)
 	if resp.StatusCode != http.StatusOK {
 		t.Fatalf("bad limit status = %d, want 200 (body=%s)", resp.StatusCode, body)
@@ -201,10 +201,10 @@ func TestAdminObservabilityLogs_EmptyBufferIs200Empty(t *testing.T) {
 	}
 }
 
-// TestAdminObservabilityLogs_ViewerReadsTail locks the viewer gate: the log tail
-// is part of the read-only monitoring surface the viewer role exists for, so a
-// viewer reads it exactly like an owner (the payload is log records, not
-// credentials).
+// TestAdminObservabilityLogs_ViewerReadsTail 锁定 viewer 门：日志尾部
+// 属于 viewer 角色存在的那个只读监控表面，因此
+// viewer 读它就像 owner 一样（载荷是日志记录，不是
+// 凭据）。
 func TestAdminObservabilityLogs_ViewerReadsTail(t *testing.T) {
 	t.Parallel()
 	srv, ts, jwt := buildEnv(t, cfgDefault(), Deps{})