docs: document ffmpeg compute param and GPU acceleration

[a-essawy]

Documents the now-live compute param on the ffmpeg job type across the reference and guide pages.

Changes

job-types/ffmpeg.mdx (API reference)

• Adds a compute <ParamField> (enum, default auto) in the same format as the other params: describes the auto NVENC/CUDA auto-routing, gpu/cpu forcing, the cpu-rejects-NVENC validation error, the Pro-plan gate (Free → 403 PLAN_LIMIT), and the h264_nvenc/hevc_nvenc/av1_nvenc encoders on NVIDIA L4.

guides/ffmpeg.mdx (how-to)

• Adds params.compute to the parameters table.
• Adds a ## GPU acceleration section: the CPU/GPU machine framing (auto by default), a before/after one-flag libx264 vs h264_nvenc <CodeGroup>, a compute: "gpu" example, and the Pro-plan / per-second billing note.

Notes

• No new components introduced; everything matches existing page grammar.
• Frontmatter validator (node scripts/validate-frontmatter.mjs) passes: 25 files, all valid.
• No fabricated speed multipliers or $/min figures. Uses the defensible "several times faster than software libx264".

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