feat(bootstrap): refactor runtime dependency management and add lazy loading for binary store and vector index

feat(agent): update import for agent session service
feat(openai): add context truncation check in OpenAI answer generator
docs(README): update frontend environment file conventions
fix(vite): default local frontend development to local backend

frontend/README.md

@@ -49,6 +49,12 @@ npm run dev
 
 启动本地开发服务器，默认访问 `http://localhost:5173`
 
+前端环境文件约定如下：
+
+- `frontend/.env.development`：本地开发，默认代理到 `http://127.0.0.1:8000`
+- `frontend/.env.production`：生产构建，默认代理到 `http://6.86.80.8:8000`
+- `frontend/.env.local`：临时覆盖本机配置，优先级高于上面两者
+
 ### 构建生产版本
 
 ```bash