- editor.ts: 新增 languageCompartment + buildLanguageExtension(lang, schema) python → lang-python, node/javascript → lang-javascript, sql/缺省 → lang-sql 新增 setLanguage(lang) 热切换; setSchema 保留当前语言不被强制切回 sql - package.json: +@codemirror/lang-python +lang-javascript - codemirror_bridge.rs: EditorInstance 新增 set_language wasm-bindgen extern (产物 public/codemirror/ 被 gitignore,本地已重建)