feat: supports OpenAI Response API and copilot's gpt-5-codex model (#2802)

* fix: upgrade vscode version

* feat: support openai response api

* refactor: refine todos tools

* fix: trim suffix empty lines

lua/avante/llm_tools/read_todos.lua

@@ -0,0 +1,40 @@
+local Base = require("avante.llm_tools.base")
+
+---@class AvanteLLMTool
+local M = setmetatable({}, Base)
+
+M.name = "read_todos"
+
+M.description = "Read TODOs from the current task"
+
+---@type AvanteLLMToolParam
+M.param = {
+  type = "table",
+  fields = {},
+  usage = {},
+}
+
+---@type AvanteLLMToolReturn[]
+M.returns = {
+  {
+    name = "todos",
+    description = "The TODOs from the current task",
+    type = "array",
+  },
+}
+
+M.on_render = function() return {} end
+
+function M.func(input, opts)
+  local on_complete = opts.on_complete
+  local sidebar = require("avante").get()
+  if not sidebar then return false, "Avante sidebar not found" end
+  local todos = sidebar.chat_history.todos or {}
+  if on_complete then
+    on_complete(vim.json.encode(todos), nil)
+    return nil, nil
+  end
+  return todos, nil
+end
+
+return M