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。

(cherry picked from commit 2113bfc125)

internal/lua/adapters/buddy.lua

@@ -55,6 +55,13 @@ function adapter.transform_request(raw_body)
     -- private one.
     req.thinking = nil
     req.extra_body = nil
+    -- ★★ buddy（腾讯 CodeBuddy）上游**只支持流式**：body.stream=false 会被
+    --    400 拒绝（实测 2026-10-19）：
+    --      11101: Non-stream chat request is currently not supported
+    --    与 Accept: text/event-stream 头无关（头早已在发），判据是 body。
+    --    故强制 stream=true，非流式请求由内核的"客户端要非流式、上游回流式"
+    --    路径消化（transform_response 需能聚合 SSE，见下）。
+    req.stream = true
     -- ★★ buddy 的 glm-5.1 **要求请求体里有非空的 reasoning_effort**，
     --    否则上游回 400：
     --      {"code":11150,"msg":"the reasoning effort value is not supported
@@ -92,7 +99,92 @@ function adapter.transform_request(raw_body)
     return json.encode(req)
 end
 
+-- aggregate_sse(raw)：把上游 SSE（data: 行流）聚合成一个非流式 OpenAI 响应。
+-- 强制 stream=true 后，内核的非流式路径会在这里收到完整 SSE 原文——必须聚合，
+-- 否则 json.decode 失败原样透传，Go 侧 unmarshal 报 invalid character 'd'。
+-- 聚合 content / reasoning_content / tool_calls（按 index 拼接分片）/
+-- finish_reason / usage；无可解析帧时返回 nil（调用方回退原样）。
+local function aggregate_sse(raw)
+    local content, reasoning = {}, {}
+    local finish, usage, id, model, created = nil, nil, nil, nil, nil
+    local tools_by_index = {}
+    local seen = false
+    for line in (raw .. "\n"):gmatch("([^\n]*)\n") do
+        local s = line:gsub("^%s+", ""):gsub("%s+$", "")
+        if s:sub(1, 5) == "data:" then
+            local payload = s:sub(6):gsub("^%s+", "")
+            if payload ~= "" and payload ~= "[DONE]" then
+                local ok, d = pcall(json.decode, payload)
+                if ok and type(d) == "table" then
+                    seen = true
+                    id = id or d.id
+                    model = model or d.model
+                    created = created or d.created
+                    if type(d.usage) == "table" then usage = d.usage end
+                    local ch = d.choices and d.choices[1]
+                    if type(ch) == "table" then
+                        if type(ch.finish_reason) == "string" and ch.finish_reason ~= "" then
+                            finish = ch.finish_reason
+                        end
+                        local dl = ch.delta
+                        if type(dl) == "table" then
+                            if type(dl.content) == "string" then content[#content + 1] = dl.content end
+                            if type(dl.reasoning_content) == "string" then
+                                reasoning[#reasoning + 1] = dl.reasoning_content
+                            end
+                            if type(dl.tool_calls) == "table" then
+                                for _, tc in ipairs(dl.tool_calls) do
+                                    if type(tc) == "table" and tc.index ~= nil then
+                                        local slot = tools_by_index[tc.index]
+                                        if slot == nil then
+                                            slot = { id = tc.id, type = tc.type or "function",
+                                                ["function"] = { name = "", arguments = "" } }
+                                            tools_by_index[tc.index] = slot
+                                        end
+                                        if tc.id then slot.id = tc.id end
+                                        local fn = tc["function"]
+                                        if type(fn) == "table" then
+                                            if fn.name then slot["function"].name = slot["function"].name .. fn.name end
+                                            if fn.arguments then slot["function"].arguments = slot["function"].arguments .. fn.arguments end
+                                        end
+                                    end
+                                end
+                            end
+                        end
+                    end
+                end
+            end
+        end
+    end
+    if not seen then return nil end
+    local msg = { role = "assistant", content = table.concat(content) }
+    local rc = table.concat(reasoning)
+    if rc ~= "" then msg.reasoning_content = rc end
+    local ordered = {}
+    for i = 0, 63 do
+        if tools_by_index[i] then ordered[#ordered + 1] = tools_by_index[i] end
+    end
+    if #ordered > 0 then msg.tool_calls = ordered end
+    local out = {
+        id = id or "", object = "chat.completion", created = created or 0,
+        model = model or "",
+        choices = { { index = 0, message = msg,
+            finish_reason = (finish and finish ~= "") and finish or "stop" } },
+    }
+    if usage then out.usage = usage end
+    local ok2, enc = pcall(json.encode, out)
+    if not ok2 then return nil end
+    return enc
+end
+
 function adapter.transform_response(raw_body)
+    -- 上游只会回流式（transform_request 强制 stream=true）。客户端要非流式时
+    -- 内核把完整 SSE 原文交到这里，先聚合再走统一转换。
+    if type(raw_body) == "string"
+        and (raw_body:match("^%s*data:") or raw_body:match("[\r\n]data:")) then
+        local aggregated = aggregate_sse(raw_body)
+        if aggregated ~= nil then raw_body = aggregated end
+    end
     -- 非流式 OpenAI 响应 → 统一信封。此前在 openai/groq/kimicode/mistral/github
     -- 五个适配器里**逐字节相同**（各 2206B，diff 为空），已抽到共享前导。
     return __prelude.openai_response(raw_body)
@@ -147,11 +239,10 @@ function adapter.transform_stream_chunk(raw_chunk)
     if delta.reasoning_content then
         unified.reasoning_content = delta.reasoning_content
     end
-    if delta.tool_calls then
-        -- Sanitize on the way OUT too: an id this upstream happily minted (it
-        -- does not validate them) becomes a landmine once the client replays
-        -- it to a Claude upstream. Only the first fragment of a streamed call
-        -- carries an id; later argument fragments have none and are untouched.
+    if type(delta.tool_calls) == "table" and #delta.tool_calls > 0 then
+        -- Do not serialize an empty Lua table as JSON `{}`. That shape is
+        -- neither an OpenAI tool-call array nor an omitted field, and several
+        -- agent clients reject it on the final chunk.
         for _, tc in ipairs(delta.tool_calls) do
             if type(tc) == "table" and tc.id ~= nil then
                 tc.id = safe_tool_id(tc.id)