fix(codearts): 识别 InferHub 未注册模型

(cherry picked from commit c9f34538ec)

internal/core/channels_dead_model_test.go

@@ -37,6 +37,9 @@ func TestDeadModelGoneJudgement(t *testing.T) {
 		{"The model does not exist", true, "does not exist"},
 		{"error: model_not_found", true, "独占一句话（行尾）"},
 		{"model_not_found.", true, "后面是句末标点"},
+		{"model is not registered", true, "CodeArts/InferHub 下架模型的真实文案"},
+		{"InferHub.002002009.404: The model is not registered, please request other model", true,
+			"CodeArts 完整 404 文案"},
 		// ── 阴性：看着像但**不是**下架 ──
 		{"error_class=model_not_found, retry allowed", false,
 			"字段名后面还有内容（初版误判下架，实测教训）"},

internal/lua/plugins/channels.lua

@@ -6789,6 +6789,7 @@ end
 -- 或收尾括号/引号，**不含逗号**。
 local DEAD_GONE_PATTERNS = {
   "model%s+not%s+found",
+  "model%s+is%s+not%s+registered",
   "unknown%s+model",
   "no%s+such%s+model",
   "nonexistent%s+model",