feat: add the missing config option for enable_debug_commands

lua/chatgpt_nvim/config.lua

@@ -115,6 +115,7 @@ function M.load()
     enable_chunking = false,
     -- New default for step-by-step
     enable_step_by_step = true
+    enable_debug_commands = false
   }
 
   if fd then
@@ -164,6 +165,9 @@ function M.load()
         if type(result.enable_step_by_step) == "boolean" then
           config.enable_step_by_step = result.enable_step_by_step
         end
+        if type(result.enable_debug_commands) == "boolean" then
+          config.enable_debug_commands = result.enable_debug_commands
+        end
       end
     end
   else