fix: LLM 工具循环 400、中断消息注入、ConPTY 终端支持

- agent: 工具轮请求尾部补 user 占位(zen 网关强制),tool 消息正确配对
- agent: 工具提醒/中断以 system 角色注入并带 [中断消息] 前缀,不进用户履历;系统提示词说明中断消息格式
- agentcli: 基于 ConPTY 的交互式终端(ptywin fork),terminal_create/read/write/resize/close/watch
- webui: server 输出通道适配器(保留 reasoning_content/disable_thinking)
- GUI: 沉浸式标题栏、icon 圆角重制、mascot 等打磨

internal/lua/adapters/server.lua

@@ -0,0 +1,103 @@
+local adapter = {}
+
+adapter.name = "server"
+adapter.version = "1.0.0"
+adapter.endpoint = "/chat/completions"
+adapter.headers = {}
+
+-- 专用于 zen 兼容网关（thinking 模式要求回传 reasoning_content）。
+-- 关键：不删除 disable_thinking（homeagent 置 true 时网关关闭 thinking，
+-- 从而不再强制要求 reasoning_content 回传）；同时保留已有 reasoning_content 双保险。
+function adapter.transform_request(raw_body)
+    local ok, req = pcall(json.decode, raw_body)
+    if not ok then return raw_body end
+    req.extra_body = nil
+    return json.encode(req)
+end
+
+function adapter.transform_response(raw_body)
+    local ok, resp = pcall(json.decode, raw_body)
+    if not ok or resp == nil then return raw_body end
+
+    local unified = {
+        content = "",
+        finish_reason = "",
+        token_usage = { prompt = 0, completion = 0, total = 0 }
+    }
+
+    if type(resp.usage) == "table" then
+        unified.token_usage.prompt = resp.usage.prompt_tokens or 0
+        unified.token_usage.completion = resp.usage.completion_tokens or 0
+        unified.token_usage.total = resp.usage.total_tokens or 0
+    end
+
+    if type(resp.choices) == "table" and #resp.choices > 0 then
+        local ch = resp.choices[1]
+        if type(ch.message) == "table" then
+            unified.content = ch.message.content or ""
+            if ch.message.reasoning_content then
+                unified.reasoning_content = ch.message.reasoning_content
+            end
+            if type(ch.message.tool_calls) == "table" then
+                local tcs = {}
+                for _, tc in ipairs(ch.message.tool_calls) do
+                    local fn = tc["function"]
+                    local name = tc.name
+                    local raw_args = tc.arguments
+                    if type(fn) == "table" then
+                        name = fn.name or name
+                        raw_args = fn.arguments or raw_args
+                    end
+                    local args = {}
+                    if type(raw_args) == "table" then
+                        args = raw_args
+                    elseif type(raw_args) == "string" and raw_args ~= "" then
+                        local args_ok, decoded = pcall(json.decode, raw_args)
+                        if args_ok and type(decoded) == "table" then
+                            args = decoded
+                        elseif args_ok then
+                            args = { value = decoded }
+                        else
+                            args = { raw = raw_args }
+                        end
+                    end
+                    if name ~= nil and name ~= "" then
+                        table.insert(tcs, {
+                            id = tc.id,
+                            type = tc.type or "function",
+                            name = name,
+                            arguments = args
+                        })
+                    end
+                end
+                unified.tool_calls = tcs
+            end
+        end
+        unified.finish_reason = ch.finish_reason or ""
+    end
+
+    return json.encode(unified)
+end
+
+function adapter.transform_stream_chunk(raw_chunk)
+    local ok, chunk = pcall(json.decode, raw_chunk)
+    if not ok then return "" end
+
+    if not chunk.choices or #chunk.choices == 0 then return "" end
+    local delta = chunk.choices[1].delta or {}
+    local fr = chunk.choices[1].finish_reason
+
+    local unified = {
+        content = delta.content or "",
+        done = (fr ~= nil)
+    }
+    if delta.reasoning_content then
+        unified.reasoning_content = delta.reasoning_content
+    end
+    if delta.tool_calls then
+        unified.tool_calls = delta.tool_calls
+    end
+    return json.encode(unified)
+end
+
+return adapter