Initial sonilo Python SDK

[spencer-zqian]

Summary

• Hand-written httpx-based Python client for the Sonilo public API
• Mirrored sync (Sonilo) and async (AsyncSonilo) surfaces sharing request builders and NDJSON parsing
• text_to_music / video_to_music with buffered generate() (returns Track) and stream() (event dicts, base64 audio decoded)
• Path/bytes/file-like video uploads; video XOR video_url validation
• Typed error hierarchy mapped from HTTP statuses and mid-stream error events
• account.services() / account.usage()
• CI (3.9 + 3.12) + manual publish workflow (publish NOT triggered; repo stays private until first release)

Spec: sonilo-api-dashboard docs/superpowers/specs/2026-07-08-sonilo-sdk-design.md

Test plan

• pytest (unit, respx-mocked)
• python -m build + wheel smoke-install
• Manual smoke: SONILO_API_KEY=... python examples/generate.py "lofi" 10