disable lua server diagnostics in twnapi.lua

apps/twnlua/docgen.py

@@ -29,6 +29,7 @@ def to_lua_type_annot(typedesc):
         return "unknown"
         # raise BaseException("Unhandled type for annotation: %s" % typedesc)
 
+print("---@diagnostic disable")
 print("error(\"townengine lua api file is not supposed to be imported!\")")
 
 type_annotations = {}