fix: 修复HTTP协议视频文件的CDN URL生成和S3存储路径问题

- 修复cache_filepath中的双斜杠问题，移除路径开头的斜杠
- 修复get_cdn_url()方法，对HTTP协议使用cache_filepath确保路径一致性
- 修复cache_submit.py中重复的协议前缀问题
- 确保CDN URL与S3存储路径完全匹配，解决AccessDenied错误

现在的映射关系:
- 存储: s3://ap-northeast-2/modal-media-cache/http/videos.pexels.com/video-files/xxx.mp4
- CDN: https://cdn.roasmax.cn/http/videos.pexels.com/video-files/xxx.mp4

src/BowongModalFunctions/models/cache_tasks/models.py

@@ -126,6 +126,8 @@ class MediaSource(BaseModel):
                     return f"{self.protocol.value}/{self.endpoint}/{self.bucket}/{self.path}"
             case MediaProtocol.http:
                 clean_path = self.path.split('?')[0] if '?' in self.path else self.path
+                # 移除路径开头的斜杠，避免双斜杠问题
+                clean_path = clean_path.lstrip('/')
                 return f"{self.protocol.value}/{self.endpoint}/{clean_path}"
             case _:
                 return f"{self.protocol.value}/{self.endpoint}/{self.bucket}/{self.path}"
@@ -163,7 +165,8 @@ class MediaSource(BaseModel):
         if self.protocol == MediaProtocol.s3:
             return f"{self.path}"
         elif self.protocol == MediaProtocol.http:
-            return f"{self.protocol.value}/{self.path}"
+            # 对于HTTP协议，使用cache_filepath确保路径一致性
+            return self.cache_filepath
         return f"{self.protocol.value}/{self.endpoint}/{self.bucket}/{self.path}"
 
     @computed_field(description="CDN挂载地址")

src/cluster/video_apps/cache_submit.py

@@ -190,7 +190,7 @@ with downloader_image.imports():
                                 raise e
                         case MediaProtocol.http:
                             try:
-                                cache_filepath = f"{config.S3_mount_dir}/{media.protocol.value}/{media.cache_filepath}"
+                                cache_filepath = f"{config.S3_mount_dir}/{media.cache_filepath}"
                                 os.makedirs(os.path.dirname(cache_filepath), exist_ok=True)
                                 download_large_file(url=media.__str__(), output_path=cache_filepath)
                             except Exception as e: