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/admin_rag_delete_test.go

@@ -10,9 +10,9 @@ import (
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/knowledge"
 )
 
-// TestAdminRagDeleteRemovesDocument proves the delete write path is real: the
-// indexed document (project entry + its chapters) is gone from the list and the
-// search, and deleting it again answers 404 rather than a fabricated success.
+// TestAdminRagDeleteRemovesDocument 证明删除写路径是真的：已索引
+// 的文档（项目条目 + 其章节）从列表与搜索中消失，
+// 再次删除它返回 404 而不是编造的成功。
 func TestAdminRagDeleteRemovesDocument(t *testing.T) {
 	t.Parallel()
 	ctx := context.Background()
@@ -67,8 +67,8 @@ func TestAdminRagDeleteRemovesDocument(t *testing.T) {
 	wantErrorShape(t, body2)
 }
 
-// TestAdminRagDeleteUnwired501 asserts an unconfigured RAG service still answers
-// honestly instead of pretending the document was removed.
+// TestAdminRagDeleteUnwired501 断言未配置的 RAG 服务仍然
+// 诚实作答，而不是假装文档已被移除。
 func TestAdminRagDeleteUnwired501(t *testing.T) {
 	t.Parallel()
 	srv, ts, jwt := buildEnv(t, cfgDefault(), Deps{})
@@ -82,7 +82,7 @@ func TestAdminRagDeleteUnwired501(t *testing.T) {
 	wantErrorShape(t, body)
 }
 
-// TestAdminRagDeleteRequiresOwner asserts the write route stays owner-gated.
+// TestAdminRagDeleteRequiresOwner 断言该写路由仍然受 owner 门控。
 func TestAdminRagDeleteRequiresOwner(t *testing.T) {
 	t.Parallel()
 	srv, ts, jwt := buildEnv(t, cfgDefault(), Deps{RAG: newRagStoreForGateway(t)})