feat: 采购管理税率+分开单价总价列 + 按单出/借库锁定扫描 + 含税法计算

- purchase: 新增tax_rate字段(model+service+frontend), 表格拆分为不含税单价/总价/税率三列
- buy.vue: 含税法计算(含税总价=数量×含税单价), 含税总价自动计算可手动覆盖
- create.vue: 按单出库模式下未选审批单时锁定摄像头和SKU输入
- borrow.vue: 未选审批单时锁定摄像头和SKU输入
- deploy_production.sql: 整合全部数据库变更(表结构+权限码+角色分配)

inventory-web/src/views/transaction/borrow.vue

@@ -64,25 +64,37 @@
       </div>
 
       <div class="scan-section">
-        <div v-if="userStore.hasPermission('op_borrow:operation')" class="camera-placeholder" @click="showCamera = true">
-          <el-icon :size="40" color="#409EFF"><CameraFilled /></el-icon>
-          <span class="text">点击开启全屏扫码</span>
-        </div>
-        <div v-else class="camera-placeholder" style="background-color: #f5f5f5; cursor: not-allowed;">
-          <el-icon :size="40" color="#909399"><CameraFilled /></el-icon>
-          <span class="text">无扫码权限</span>
-        </div>
-
-        <div class="input-box">
-          <el-input
-              v-model="barcodeInput"
-              placeholder="扫描或输入条码回车"
-              @keyup.enter="handleManualInput"
-              clearable
-              ref="barcodeRef"
-              size="large"
-              :disabled="!userStore.hasPermission('op_borrow:operation')"
-          >
+        <template v-if="!selectedApprovalId">
+          <div class="camera-placeholder" style="background-color: #f5f5f5; cursor: not-allowed;">
+            <el-icon :size="40" color="#909399"><CameraFilled /></el-icon>
+            <span class="text">请先选择审批单</span>
+          </div>
+          <div class="input-box">
+            <el-input v-model="barcodeInput" placeholder="请先选择审批单" disabled size="large">
+              <template #prefix><el-icon><Scissor /></el-icon></template>
+              <template #append><el-button disabled>添加</el-button></template>
+            </el-input>
+          </div>
+        </template>
+        <template v-else>
+          <div v-if="userStore.hasPermission('op_borrow:operation')" class="camera-placeholder" @click="showCamera = true">
+            <el-icon :size="40" color="#409EFF"><CameraFilled /></el-icon>
+            <span class="text">点击开启全屏扫码</span>
+          </div>
+          <div v-else class="camera-placeholder" style="background-color: #f5f5f5; cursor: not-allowed;">
+            <el-icon :size="40" color="#909399"><CameraFilled /></el-icon>
+            <span class="text">无扫码权限</span>
+          </div>
+          <div class="input-box">
+            <el-input
+                v-model="barcodeInput"
+                placeholder="扫描或输入条码回车"
+                @keyup.enter="handleManualInput"
+                clearable
+                ref="barcodeRef"
+                size="large"
+                :disabled="!userStore.hasPermission('op_borrow:operation')"
+            >
             <template #prefix>
               <el-icon><Scissor /></el-icon>
             </template>
@@ -91,6 +103,7 @@
             </template>
           </el-input>
         </div>
+        </template>
       </div>
 
       <div class="cart-section">