fix(copilot): the tool_call index starts from 1 in copilot + claude-sonnet-4.5 (#2794)

lua/avante/config.lua

@@ -320,7 +320,7 @@ M._defaults = {
     ---@type AvanteSupportedProvider
     claude = {
       endpoint = "https://api.anthropic.com",
-      model = "claude-sonnet-4-20250514",
+      model = "claude-sonnet-4-5-20250929",
       timeout = 30000, -- Timeout in milliseconds
       context_window = 200000,
       extra_request_body = {

lua/avante/providers/openai.lua

@@ -218,7 +218,7 @@ end
 function M:finish_pending_messages(ctx, opts)
   if ctx.content ~= nil and ctx.content ~= "" then self:add_text_message(ctx, "", "generated", opts) end
   if ctx.tool_use_list then
-    for _, tool_use in ipairs(ctx.tool_use_list) do
+    for _, tool_use in pairs(ctx.tool_use_list) do
       if tool_use.state == "generating" then self:add_tool_use_message(ctx, tool_use, "generated", opts) end
     end
   end