feat(purchase): 新增采购管理前端页面与路由（列表+新建+审批）

inventory-web/src/api/purchase.ts

@@ -0,0 +1,91 @@
+import request from '@/utils/request'
+
+export interface PurchaseItem {
+  id?: number
+  request_no?: string
+  name: string
+  spec_model?: string
+  quantity: number
+  purchase_date: string
+  supplier_link?: string
+  remark?: string
+  images?: string[]
+  unit_price?: number
+  total_price?: number
+  status: number
+  status_text?: string
+  requester_id?: number
+  requester_name?: string
+  approver_id?: number
+  approver_name?: string
+  approved_at?: string
+  reject_reason?: string
+  created_at?: string
+  updated_at?: string
+}
+
+export interface Approver {
+  id: number
+  username: string
+  email: string
+  role: string
+}
+
+// 获取采购申请列表
+export function getPurchaseList(params: {
+  page?: number
+  limit?: number
+  status?: number
+}) {
+  return request({
+    url: '/purchase',
+    method: 'get',
+    params
+  })
+}
+
+// 创建采购申请
+export function createPurchase(data: PurchaseItem) {
+  return request({
+    url: '/purchase',
+    method: 'post',
+    data
+  })
+}
+
+// 获取采购申请详情
+export function getPurchaseDetail(id: number) {
+  return request({
+    url: `/purchase/${id}`,
+    method: 'get'
+  })
+}
+
+// 审批采购申请
+export function approvePurchase(id: number, data: {
+  action: 'approve' | 'reject'
+  reject_reason?: string
+}) {
+  return request({
+    url: `/purchase/${id}/approve`,
+    method: 'patch',
+    data
+  })
+}
+
+// 获取可选审批人列表
+export function getPurchaseApprovers() {
+  return request({
+    url: '/purchase/approvers',
+    method: 'get'
+  })
+}
+
+// 根据名称/规格自动补全
+export function autoFillPurchase(keyword: string) {
+  return request({
+    url: '/purchase/auto-fill',
+    method: 'get',
+    params: { keyword }
+  })
+}