IgorShadurin/app.yumcut.com ? reverse-engineered prompt

Build me a self hosted web app like YumCut for making short vertical videos from a simple idea or prompt. I want it to feel made for TikTok, Reels, and YouTube Shorts, where someone can type an idea and get a ready to post 9:16 video with an auto written script, generated scenes or visuals, AI voiceover, subtitles, and an optional watermark.

Please make it good for faceless content and repeatable workflows, not just one off video generation. I want templates, easy style and hook variations, batch creation for multiple videos or clients, and support for making the same video in different languages. It should be low cost, local first where possible, and work well with FFmpeg for rendering.

Also include a simple account area with API keys so people can automate project creation, check status, cancel jobs, and download final media through a user API. Keep it open source friendly and practical for creators or small agencies. Look up current docs online if you need to.