docs: 更新项目文档，完善需求和技术细节

scripts/backend/initDatabase.js

@@ -131,12 +131,55 @@ class DatabaseInitializer {
     console.log('✅ 数据库连接验证通过');
     console.log('─'.repeat(50));
 
-    // 这里可以添加具体的表创建逻辑
+    // 检查并创建uploads表
+    const uploadsTableExists = await this.checkTableExists('uploads');
+    if (!uploadsTableExists) {
+      console.log('📁 创建uploads表...');
+      await this.createUploadsTable();
+    } else {
+      console.log('✅ uploads表已存在');
+    }
+
     console.log('📋 数据库初始化完成');
     console.log('✅ 所有检查通过，数据库连接正常');
 
     await this.closeConnection();
   }
+
+  /**
+   * 创建uploads表
+   */
+  async createUploadsTable() {
+    const createTableSQL = `
+      CREATE TABLE uploads (
+        id BIGINT AUTO_INCREMENT PRIMARY KEY,
+        user_id BIGINT UNSIGNED NOT NULL,
+        original_name VARCHAR(255) NOT NULL,
+        stored_name VARCHAR(255) NOT NULL,
+        file_path VARCHAR(500) NOT NULL,
+        file_size BIGINT NOT NULL,
+        mime_type VARCHAR(100) NOT NULL,
+        file_type ENUM('image', 'document', 'other') DEFAULT 'image',
+        upload_type VARCHAR(50) NOT NULL COMMENT '上传类型: avatar, product, identification, etc',
+        status ENUM('active', 'deleted') DEFAULT 'active',
+        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+        FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
+        INDEX idx_user_id (user_id),
+        INDEX idx_upload_type (upload_type),
+        INDEX idx_created_at (created_at)
+      ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='文件上传记录表'
+    `;
+
+    try {
+      await this.connection.execute(createTableSQL);
+      console.log('✅ uploads表创建成功');
+      return true;
+    } catch (error) {
+      console.error('❌ 创建uploads表失败:', error.message);
+      return false;
+    }
+  }
 }
 
 // 执行初始化