* feat: support multimodal LLM inputs - add model capability config for vision, audio, and video inputs - wire multimodal flags through simple app, chat agent, and workflow LLM nodes - normalize uploaded files and file links into image/audio/video request parts - adapt chat, agent, and toolcall runtime context for multimodal messages - add capability tags, i18n entries, design docs, and related tests * perf: code * test: update agent file prompt assertion --------- Co-authored-by: archer <545436317@qq.com>
