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/history_after_test.go

@@ -9,9 +9,9 @@ import (
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/history"
 )
 
-// TestHistoryListMessagesAfterCursor covers the forward cursor (A5): after returns the
-// strictly-newer messages oldest-first, before keeps its existing newest-first behavior,
-// and the two cursors are mutually exclusive.
+// TestHistoryListMessagesAfterCursor 覆盖前向游标（A5）：after 返回
+// 严格更新的消息且最旧优先，before 保持既有的最新优先行为，
+// 两个游标互斥。
 func TestHistoryListMessagesAfterCursor(t *testing.T) {
 	t.Parallel()
 	_, ts, jwt, st := newHistoryEnv(t)
@@ -24,7 +24,7 @@ func TestHistoryListMessagesAfterCursor(t *testing.T) {
 	tok := signAny(t, jwt, "acct", auth.RoleOwner)
 	base := ts.URL + "/api/v1/sessions/" + history.MainSessionID + "/messages"
 
-	// after=2000 → strictly newer, oldest first.
+	// after=2000 → 严格更新，最旧优先。
 	resp, body := doReq(t, http.MethodGet, base+"?after=2000", nil, tok)
 	if resp.StatusCode != http.StatusOK {
 		t.Fatalf("after status = %d, want 200 (body=%s)", resp.StatusCode, body)
@@ -35,7 +35,7 @@ func TestHistoryListMessagesAfterCursor(t *testing.T) {
 		t.Fatalf("after=2000 = %+v, want ascending [3000 4000]", forward)
 	}
 
-	// after at the newest message → empty page, still 200.
+	// after 设为最新消息 → 空页，仍为 200。
 	resp, body = doReq(t, http.MethodGet, base+"?after=4000", nil, tok)
 	if resp.StatusCode != http.StatusOK {
 		t.Fatalf("after newest status = %d, want 200 (body=%s)", resp.StatusCode, body)
@@ -46,7 +46,7 @@ func TestHistoryListMessagesAfterCursor(t *testing.T) {
 		t.Fatalf("after=4000 = %+v, want empty", empty)
 	}
 
-	// before behavior is unchanged: newest first, strictly older.
+	// before 行为不变：最新优先，严格更旧。
 	resp, body = doReq(t, http.MethodGet, base+"?before=3000&limit=2", nil, tok)
 	if resp.StatusCode != http.StatusOK {
 		t.Fatalf("before status = %d, want 200 (body=%s)", resp.StatusCode, body)
@@ -57,7 +57,7 @@ func TestHistoryListMessagesAfterCursor(t *testing.T) {
 		t.Fatalf("before=3000 = %+v, want descending [2000 1000]", backward)
 	}
 
-	// after=0 is not a forward bound → falls back to the default newest-first page.
+	// after=0 不是前向边界 → 回退到默认的最新优先页。
 	resp, body = doReq(t, http.MethodGet, base+"?after=0&limit=2", nil, tok)
 	if resp.StatusCode != http.StatusOK {
 		t.Fatalf("after=0 status = %d, want 200 (body=%s)", resp.StatusCode, body)
@@ -69,8 +69,8 @@ func TestHistoryListMessagesAfterCursor(t *testing.T) {
 	}
 }
 
-// TestHistoryListMessagesAfterRejectsBadInput covers the 400s: both cursors together,
-// and a negative or non-numeric after.
+// TestHistoryListMessagesAfterRejectsBadInput 覆盖那些 400：两个游标同时
+// 给出，以及 after 为负或非数字。
 func TestHistoryListMessagesAfterRejectsBadInput(t *testing.T) {
 	t.Parallel()
 	_, ts, jwt, _ := newHistoryEnv(t)
@@ -78,9 +78,9 @@ func TestHistoryListMessagesAfterRejectsBadInput(t *testing.T) {
 	base := ts.URL + "/api/v1/sessions/" + history.MainSessionID + "/messages"
 
 	for _, q := range []string{
-		"?after=1000&before=3000", // both cursors
-		"?after=-1",               // negative
-		"?after=abc",              // non-numeric
+		"?after=1000&before=3000", // 两个游标都给
+		"?after=-1",               // 负数
+		"?after=abc",              // 非数字
 	} {
 		resp, body := doReq(t, http.MethodGet, base+q, nil, tok)
 		if resp.StatusCode != http.StatusBadRequest {
@@ -89,8 +89,8 @@ func TestHistoryListMessagesAfterRejectsBadInput(t *testing.T) {
 	}
 }
 
-// TestHistoryListMessagesAfterPlatformFilter asserts the platform filter composes with
-// the forward cursor.
+// TestHistoryListMessagesAfterPlatformFilter 断言平台过滤与前向游标
+// 可以组合。
 func TestHistoryListMessagesAfterPlatformFilter(t *testing.T) {
 	t.Parallel()
 	_, ts, jwt, st := newHistoryEnv(t)
@@ -119,8 +119,8 @@ func TestHistoryListMessagesAfterPlatformFilter(t *testing.T) {
 	}
 }
 
-// TestHistoryListMessagesAfterLimitClamp asserts the forward page is capped at 200 like
-// the backward one, and that advancing the returned cursor pages forward without a gap.
+// TestHistoryListMessagesAfterLimitClamp 断言前向页与后向一样上限 200，
+// 且推进返回的游标能无缝隙地向前翻页。
 func TestHistoryListMessagesAfterLimitClamp(t *testing.T) {
 	t.Parallel()
 	_, ts, jwt, st := newHistoryEnv(t)