feat: add Reactor.inc fast-h3 video generation API provider to MediaGen and FableLoom - #6224
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…en and FableLoom (#6214) Adds server/services/videoGen/reactor.js — a token-minting/submit/poll/download provider mirroring videoGen/fal.js's queue REST contract — as a first-class mediaJobQueue cloud-lane video backend with native clip-to-clip chaining via continue_from_clip_id. A new GET /api/video-gen/reactor/token route mints a short-lived, scoped session JWT from REACTOR_API_KEY server-side (never exposed to the client), re-minted automatically if a render's poll loop outlives the session. Wires 'reactor' through the VIDEO_GEN_MODE alphabet, the video pin ladder, prepareVideoGenParams' backend short-circuit, submitJob's dispatch, and the VideoGen page's backend switch (clip id / clip length / seed fields), plus a Settings > Image Gen field for the REACTOR_API_KEY / API key.
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Summary
server/services/videoGen/reactor.js— a token-minting/submit/poll/download cloud video provider for reactor.inc'sfast-h3model, mirroring thevideoGen/fal.jsqueue-REST contract as a first-classmediaJobQueuecloud-lane backend.GET /api/video-gen/reactor/tokenroute mints a short-lived, scoped session JWT fromREACTOR_API_KEYserver-side — the raw key never reaches the client — with automatic re-minting if a render's poll loop outlives the session.continue_from_clip_id,starting_frame(image-to-video),seconds, andseed.reactorthrough theVIDEO_GEN_MODEalphabet, the video pin ladder,prepareVideoGenParams' backend short-circuit,submitJob's dispatch, and resume-from-active-job param restore.reactorbackend option to the VideoGen page (clip id / clip length / seed fields) and FableLoom's render backend picker, plus a Settings → Image Gen field for theREACTOR_API_KEY/ API key.Closes #6214
Test plan
server/services/videoGen/reactor.test.js— 13 new tests covering token minting/failure, request-body building (including prompt truncation and seed=0 preservation), full submit→poll→download→history flow, error handling, chaining params, and automatic token re-mint on a 401 mid-poll.server/services/videoGen/*,server/services/mediaJobQueue/*,server/routes/videoGen.test.js,server/lib/{generationModes,validation}.test.js(1213 passed), and the client hooks/pages/settings suites touched by this change (125 passed).npx biome lintclean on all touched client files.opencodeagainst the branch diff; applied its findings (JWT re-mint on 401, resume-param whitelist gap forcontinueFromClipId/seconds,seed=0dropped by|| undefined, dead width/height fields in the reactor payload).