feat: 新增短剧/媒体生成能力并脱敏数据库脚本

- 新增音频/视频/图片生成服务与 Atlas、OpenAI 实现
- 新增短剧脚本生成、分镜与 ffmpeg 合成模块
- 新增 Coze/Dify 聊天 provider 及 Agent 配置
- 脱敏 SQL 脚本：移除真实 DeepSeek API Key，掩码 COS 桶名
- 清理过期的 SQL update 脚本与 chat 文档

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

ruoyi-common/ruoyi-common-core/src/main/java/org/ruoyi/common/core/service/OssService.java

@@ -1,8 +1,11 @@
 package org.ruoyi.common.core.service;
 
+import jakarta.servlet.http.HttpServletResponse;
 import org.ruoyi.common.core.domain.dto.OssDTO;
 import org.springframework.web.multipart.MultipartFile;
 
+import java.io.File;
+import java.io.IOException;
 import java.util.List;
 
 /**
@@ -33,5 +36,19 @@ public interface OssService {
      */
     OssDTO uploadFile(MultipartFile file);
 
+    /**
+     * Upload a server-side file without buffering the complete payload in memory.
+     */
+    OssDTO uploadFile(File file);
+
+    /**
+     * Stream an object as an authenticated attachment response.
+     */
+    void downloadFile(Long ossId, HttpServletResponse response) throws IOException;
+
+    /**
+     * Delete one object and its sys_oss metadata.
+     */
+    Boolean deleteFile(Long ossId);
 
 }