feat(system): 优化文件上传功能并添加前端上传组件

- 修改后端文件上传接口，返回上传文件的URL
- 新增文件上传前的本地校验逻辑- 实现文件拖拽上传功能
- 添加两个新的前端上传组件：CuteFileUpload 和 CuteFileDragUpload
- 更新后端 MinioRepository 类，支持生成预签名 URL

cutejava-front/src/views/components/business/CuteFileDragUpload.vue

@@ -0,0 +1,69 @@
+<template>
+  <el-upload
+    ref="upload"
+    drag
+    :limit="1"
+    :before-upload="beforeUpload"
+    :auto-upload="true"
+    :headers="headers"
+    :on-success="handleSuccess"
+    :on-error="handleError"
+    :action="ossUploadApi"
+  >
+    <i class="el-icon-upload" />
+    <div class="el-upload__text">将文件拖到此处，或<em>点击上传</em></div>
+    <div slot="tip" class="el-upload__tip">只能上传不超过100MB的文件</div>
+  </el-upload>
+</template>
+
+<script>
+import { Message } from 'element-ui'
+import { mapGetters } from 'vuex'
+import { getToken } from '@/utils/auth'
+export default {
+  name: 'CuteFileUpload',
+  props: {
+    value: {
+      type: Object,
+      required: true,
+      default: null
+    }
+  },
+  data() {
+    return {
+      headers: { 'Authorization': getToken() }
+    }
+  },
+  computed: {
+    ...mapGetters([
+      'baseApi',
+      'ossUploadApi'
+    ])
+  },
+  methods: {
+    beforeUpload(file) {
+      let isLt2M = true
+      isLt2M = file.size / 1024 / 1024 < 100
+      if (!isLt2M) {
+        this.$message.error('上传文件大小不能超过 100MB')
+        return false
+      }
+      return isLt2M
+    },
+    // 监听上传失成功
+    handleSuccess(response, file, fileList) {
+      // Message.success('上传成功')
+      // this.$refs.upload.clearFiles()
+      console.error('response', response)
+      console.error('file', file)
+      console.error('fileList', fileList)
+      this.value.fileUrl = response
+    },
+    // 监听上传失败
+    handleError(e, file, fileList) {
+      const msg = JSON.parse(e.message)
+      Message.error(msg.message)
+    }
+  }
+}
+</script>