fix: add ignore_files to config

lua/chatgpt_nvim/config.lua

@@ -109,7 +109,6 @@ function M.load()
         if type(result.default_prompt_blocks) == "table" then
           config.default_prompt_blocks = result.default_prompt_blocks
         end
-        -- Removed prompt_char_limit handling
         if type(result.project_name) == "string" then
           config.project_name = result.project_name
         end
@@ -122,6 +121,9 @@ function M.load()
         if type(result.include_file_contents) == "boolean" then
           config.include_file_contents = result.include_file_contents
         end
+        if type(result.ignore_files) == "table" then
+          config.ignore_files = result.ignore_files
+        end
         if type(result.preview_changes) == "boolean" then
           config.preview_changes = result.preview_changes
         end