fix(channels): 四渠道修复 —— qoder 裸 token 领取 / trae+buddy 非流式 / opencode 目录 / 隐藏适配器

生产实测逐渠道排查（2026-10-19）：

* qoder：PKCE 设备码流无 register 第二跳，落库凭据是裸 token 字符串；
  qoderClaim 硬要求结构化 table 导致「缺少凭据对象」（而 account_test
  走 token 路径正常 —— 自相矛盾状态）。改为非空裸 tok 就地包
  {access_token=tok}；补 TestQoderClaimAcceptsBareTokenCredential。

* trae（SOLO 自装适配器）：上游对非流式请求也回 SSE（event: 前缀帧），
  transform_response 不识别 → 整个 body 原样透传 → Go unmarshal 报
  invalid character 'e'。补 aggregate_solo_sse 聚合。

* buddy（CodeBuddy）：上游 400 11101 只支持流式。transform_request 强制
  stream=true；transform_response 补 SSE 聚合（tool_calls 按 index 拼分片）。

* provider 流式：真实 tool-call 片段之后出现 finish_reason=stop 时归一为
  tool_calls（trae 实测如此发）；buddy/trae 不再序列化空 tool_calls 表。

* opencode：远端目录端点改为 /zen/v1/models（裸 /v1/models 回 HTML）；
  兜底目录同步 2026-10-19 实测（space-bunny-free 410 下架等 5 项变化）。
  opencodezen 适配器 v1.1.0：会话亲和（client_session / 首 user 消息指纹
  分桶），保留免费层门禁四要素。

* 内核：适配器可声明 adapter.hidden = true 退出用户可见列表；被源引用的
  隐藏适配器保持可见（源编辑器要回显当前值）。opencodezen 默认隐藏。

* channels UI：切渠道立即清空账号/模型区 + 响应代际校验，修复 qoder 账号
  闪现在 opencode 卡片下的渲染竞态。

* channels request_end hook：挂接丢失的 isModelGone/recordDeadModel ——
  真实 404（如 codearts GLM-5.3 "The model is not registered"）现在会进
  deadModels，不再每轮 404 仍可选中。

internal/provider/provider.go

@@ -1260,6 +1260,7 @@ func (p *Provider) ChatStream(ctx context.Context, req *types.ChatRequest) (<-ch
 		var realChunks int
 		var doneSeen bool
 		var doneSent bool
+		var sawToolCalls bool
 		// toolIdx maps a per-stream tool fragment's upstream index (Anthropic
 		// content-block ordinal, which is sparse when thinking/text blocks
 		// precede tool_use) to a dense 0-based OpenAI tool_call ordinal so
@@ -1303,6 +1304,19 @@ func (p *Provider) ChatStream(ctx context.Context, req *types.ChatRequest) (<-ch
 			if err := json.Unmarshal([]byte(unified), &ck); err != nil {
 				continue
 			}
+			// A few OpenAI-compatible upstreams emit a final `stop` marker
+			// after streaming tool-call fragments. Once a real fragment was
+			// observed, the gateway must preserve tool-call semantics for the
+			// agent instead of making it treat the turn as ordinary text.
+			if len(ck.ToolCalls) > 0 {
+				trimmed := strings.TrimSpace(string(ck.ToolCalls))
+				if trimmed != "null" && trimmed != "[]" && trimmed != "{}" {
+					sawToolCalls = true
+				}
+			}
+			if sawToolCalls && ck.FinishReason == "stop" {
+				ck.FinishReason = "tool_calls"
+			}
 			ck.ToolCalls = toolIdx.remap(ck.ToolCalls)
 			if ck.Done {
 				doneSent = true

internal/provider/provider_test.go

@@ -93,7 +93,39 @@ func TestProviderChatStream(t *testing.T) {
 	}
 }
 
-// TestStreamSuccessClearsBackoff guards P6: a clean streaming end must reset
+func TestProviderChatStreamNormalizesStopAfterToolCall(t *testing.T) {
+	up := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "text/event-stream")
+		fmt.Fprint(w, "data: "+`{"choices":[{"delta":{"tool_calls":[{"index":0,"id":"call-1","type":"function","function":{"name":"f"}}]}}]}`+"\n\n")
+		fmt.Fprint(w, "data: "+`{"choices":[{"delta":{"tool_calls":[{"index":0,"function":{"arguments":"{}"}}]},"finish_reason":"stop"}]}`+"\n\n")
+		fmt.Fprint(w, "data: [DONE]\n\n")
+	}))
+	defer up.Close()
+	p := newTestProvider(t, src("mock", up.URL, "openai", "m"))
+	ch, err := p.ChatStream(context.Background(), &types.ChatRequest{
+		Model: "m", Stream: true,
+		Messages: []types.ChatMessage{{Role: "user", Content: types.StringContent("x")}},
+	})
+	if err != nil {
+		t.Fatalf("stream: %v", err)
+	}
+	var sawTool, sawToolFinish bool
+	for ck := range ch {
+		if len(ck.ToolCalls) > 0 && string(ck.ToolCalls) != "{}" {
+			sawTool = true
+		}
+		if ck.FinishReason == "tool_calls" {
+			sawToolFinish = true
+		}
+	}
+	if !sawTool {
+		t.Fatal("stream dropped the tool-call fragment")
+	}
+	if !sawToolFinish {
+		t.Fatal("stop after a tool call was not normalized to tool_calls")
+	}
+}
+
 // a previously cooled (source, model) pair.
 func TestStreamSuccessClearsBackoff(t *testing.T) {
 	var fail atomic.Bool