feat: 添加 OSS 存储配额功能

- 数据库：添加 oss_storage_quota 字段（0 表示无限制）
- 后端：登录/用户信息返回 OSS 配额
- 后端：管理员可设置用户 OSS 配额
- 后端：上传时检查 OSS 配额限制
- 前端：管理员编辑用户增加 OSS 配额设置
- 前端：用户文件页面显示 OSS 使用量和配额

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/app.js

@@ -239,6 +239,7 @@ createApp({
       storagePermission: 'oss_only', // 存储权限
       localQuota: 0, // 本地存储配额（字节）
       localUsed: 0, // 本地存储已使用（字节）
+      ossQuota: 0, // OSS 存储配额（字节，0表示无限制）
 
 
       // 右键菜单
@@ -653,6 +654,7 @@ handleDragLeave(e) {
           this.storageType = this.user.current_storage_type || 'oss';
           this.localQuota = this.user.local_storage_quota || 0;
           this.localUsed = this.user.local_storage_used || 0;
+          this.ossQuota = this.user.oss_storage_quota || 0;
 
           console.log('[登录] 存储权限:', this.storagePermission, '存储类型:', this.storageType, 'OSS配置:', this.user.oss_config_source);
 
@@ -1157,6 +1159,7 @@ handleDragLeave(e) {
           this.storageType = this.user.current_storage_type || 'oss';
           this.localQuota = this.user.local_storage_quota || 0;
           this.localUsed = this.user.local_storage_used || 0;
+          this.ossQuota = this.user.oss_storage_quota || 0;
 
           console.log('[页面加载] Cookie验证成功，存储权限:', this.storagePermission, '存储类型:', this.storageType);
 
@@ -1912,7 +1915,8 @@ handleDragLeave(e) {
           params: {
             filename: file.name,
             path: this.currentPath,
-            contentType: file.type || 'application/octet-stream'
+            contentType: file.type || 'application/octet-stream',
+            fileSize: file.size
           }
         });
 
@@ -2655,6 +2659,23 @@ handleDragLeave(e) {
         this.editStorageForm.quota_unit = 'MB';
       }
       
+      // OSS 配额初始化
+      const ossQuotaBytes = user.oss_storage_quota || 0;
+      if (ossQuotaBytes === 0) {
+        this.editStorageForm.oss_storage_quota_value = 0;
+        this.editStorageForm.oss_quota_unit = "GB";
+      } else {
+        const ossQuotaMB = ossQuotaBytes / 1024 / 1024;
+        const ossQuotaGB = ossQuotaMB / 1024;
+        if (ossQuotaMB >= 1024 && ossQuotaMB % 1024 === 0) {
+          this.editStorageForm.oss_storage_quota_value = ossQuotaGB;
+          this.editStorageForm.oss_quota_unit = "GB";
+        } else {
+          this.editStorageForm.oss_storage_quota_value = Math.round(ossQuotaMB);
+          this.editStorageForm.oss_quota_unit = "MB";
+        }
+      }
+      
       this.showEditStorageModal = true;
     },
 
@@ -2669,11 +2690,22 @@ handleDragLeave(e) {
           quotaBytes = this.editStorageForm.local_storage_quota_value * 1024 * 1024;
         }
 
+        // 计算 OSS 配额字节数
+        let ossQuotaBytes = 0;
+        if (this.editStorageForm.oss_storage_quota_value > 0) {
+          if (this.editStorageForm.oss_quota_unit === "GB") {
+            ossQuotaBytes = this.editStorageForm.oss_storage_quota_value * 1024 * 1024 * 1024;
+          } else {
+            ossQuotaBytes = this.editStorageForm.oss_storage_quota_value * 1024 * 1024;
+          }
+        }
+
         const response = await axios.post(
           `${this.apiBase}/api/admin/users/${this.editStorageForm.userId}/storage-permission`,
           {
             storage_permission: this.editStorageForm.storage_permission,
-            local_storage_quota: quotaBytes
+            local_storage_quota: quotaBytes,
+            oss_storage_quota: ossQuotaBytes
           },
         );