feat: 实现基础设施层

axios 请求封装及七个业务模块 API，Pinia 状态管理（auth/system/models/tools），Mock 适配器与数据，以及流式对话、轮询、倒计时组合式函数。

frontend/src/api/modules/model.ts

@@ -0,0 +1,48 @@
+import { get, post, put, del } from '../request'
+import type { ModelItem, ModelForm, TrainedModel } from '@/types'
+
+/** 模型列表 */
+export const getModelList = () => get<ModelItem[]>('/model-manage')
+
+/** 模型详情 */
+export const getModel = (id: string | number) => get<ModelItem>(`/model-manage/${id}`)
+
+/** 按名称查模型 */
+export const getModelByName = (name: string) => get<ModelItem>(`/model-manage/name/${name}`)
+
+/** 本地模型路径列表 */
+export const getLocalModels = () =>
+  get<{ models: { path: string; name: string }[] }>('/model-manage/local-models')
+
+/** 已训练模型列表 */
+export const getTrainedModels = () =>
+  get<{ models: TrainedModel[] }>('/model-manage/trained-models')
+
+/** 创建模型 */
+export const createModel = (data: ModelForm) => post('/model-manage', data)
+
+/** 编辑模型 */
+export const updateModel = (id: string | number, data: ModelForm) =>
+  put(`/model-manage/${id}`, data)
+
+/** 删除模型 */
+export const deleteModel = (id: string | number) => del(`/model-manage/${id}`)
+
+/** 删除已训练模型（合并权重） */
+export const deleteTrainedModel = (id: string | number, type: 'merged' | 'lora' = 'merged') =>
+  del(`/model-manage/trained-models/${id}`, { type })
+
+/** 更新模型用途 */
+export const updateModelPurpose = (id: string | number, purpose: string) =>
+  put(`/model-manage/${id}/purpose`, { purpose })
+
+/** 合并 LoRA 权重 */
+export const mergeModel = (data: {
+  model_name: string
+  train_method: string
+  base_model_path: string
+}) => post('/model-manage/merge', data)
+
+/** 导出已训练模型权重 */
+export const exportModelUrl = (modelName: string) =>
+  `/api/model-manage/trained-models/${encodeURIComponent(modelName)}/export`