用户CI Test
c947abc038
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P0-1: _download_library_assets 支持双模式查询（asset_library_id / project_id）
下载失败时抛出 RuntimeError，不再静默忽略
P0-2: OSS 上传失败抛异常 + 上传后 HEAD 校验 URL 可访问性
P0-3: run_ffmpeg 失败时完整 stderr 打到日志（排查 exit code 183）
_execute_ffmpeg 额外记录 filter_complex 便于诊断
P1: template_id 存在性校验（不存在/已禁用 → ValueError）
asset_ids 归属校验（不属于指定项目/素材库 → ValueError）
新增 16 个单元测试覆盖全部修复点，全量 1170 测试通过无回归