Alibaba's Wan 3.0 generation went live on FAL (was "Coming Soon" since
the Wan 2.7 rollout). Adds two families to FAL_FAMILIES:
- wan-3.0: alibaba/wan-3.0/{text,image}-to-video — 2-30s integer
durations, 480p/720p/1080p, native audio, adaptive aspect handling
($0.05-$0.20/s by resolution)
- wan-3.0-prime: alibaba/wan-3.0-prime/{text,image}-to-video — premium
tier, same surface ($0.068-$0.28/s)
Schema quirks mapped from the FAL OpenAPI/llms.txt:
- i2v takes `start_image_url` (image_param_key, Kling-4K pattern)
- duration is a JSON integer (duration_int)
- audio toggle key is `audio`, not `generate_audio` — new generic
`audio_param_key` family flag in _build_payload (veo3.1 regression
asserted unchanged)
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