Runway

Build me a thin video-generation workbench over hosted models, in place of Runway. Requirements: - A local web page on localhost:3300: Node + Express, a prompt box, a model picker, and a gallery of past generations. - Generate via the Replicate API (token in .env) against current open video models (Wan/LTX/Hunyuan class). Pick one provider and stick to it; fal.ai only if it has a model Replicate lacks. - Poll the job, download the mp4 to ~/generations/YYYY-MM-DD/, and record prompt, model, params, cost, and file path in SQLite (better-sqlite3). - Image-to-video: upload a still and pass it as the conditioning frame. - Show a month-to-date spend total computed from per-job cost so usage stays honest. - No accounts, no telemetry; prompts and outputs stay local except the API calls themselves. - Out of scope: editing timelines, inpainting, and anything realtime. Do not build model hosting or a job queue beyond simple polling. - README: where to get the Replicate token, rough dollars per second of video on the default model, and a note that this rents models rather than replacing Runway, whose frontier video models and compute cannot be rebuilt solo.