Release v3.0.1

• Fix chapter splitting (/play … split: true): only the first chapter played because every chapter shared one cache entry keyed by the video URL; cache keys are now segment-aware (URL + offset + length).
• Fix "The application did not respond" when skipping or resuming into a slow or unplayable track: /skip, /next, /unskip, and /resume now defer the interaction before resolving media, and an unplayable track is skipped to the next one instead of surfacing a spurious error (this also makes automatic queue advancement resilient to bad tracks).
• Fix /skip (and /unskip//seek) advancing an extra track: deliberately stopping the current stream to start a new one fired the queue's auto-advance handler a second time. The handler is now detached before the switch, so skipping moves exactly as far as requested.
• Add structured logging via pino, configurable with LOG_FORMAT (plain default, json, or ecs) and LOG_LEVEL (info default). Command invocations, queue and track changes, and playback or media-extraction failures now surface in logs by default instead of being silent; verbose per-component detail is available at LOG_LEVEL=debug.
• Build and publish a multi-arch pre-release image to ghcr.io/bunkerlab-net/mochi:edge (and :sha-<commit>) on every push to master, so changes can be tested before a release.