feat(pipewire): make auto-connect configurable

[roderickvd]

JACK has a knob to control auto-connection behavior. Add it to PipeWire too.

[Copilot]

Pull request overview

Adds a configurable port auto-connection knob to the PipeWire backend, mirroring the JACK backend's set_connect_automatically API. The setting is threaded from the Host through init_devices to each Device via a shared Arc<AtomicBool>, and is read at stream-connect time to toggle the AUTOCONNECT flag on the PipeWire stream. The PR also exports PipeWireHost from src/platform/mod.rs so callers can reach the new API, and minorly cleans up the JACK module doc-comment now that PipeWire offers a similar option.

Changes:

• New Host::set_connect_automatically on the PipeWire backend, plumbed through init_devices → Device → ConnectParams and used to conditionally set StreamFlags::AUTOCONNECT in both input and output stream connect paths.
• Re-export crate::host::pipewire::Host as PipeWireHost from src/platform/mod.rs under the appropriate cfg.
• JACK module documentation tweaks to reflect that PipeWire now has a similar configuration option.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/host/pipewire/mod.rs	Adds Arc<AtomicBool> field on Host and the set_connect_automatically setter with docs.
src/host/pipewire/device.rs	Stores the shared Arc<AtomicBool> on each Device and forwards its value into ConnectParams.
src/host/pipewire/stream.rs	New connect_automatically field on ConnectParams; conditionally sets AUTOCONNECT flag in input/output stream connect paths.
src/platform/mod.rs	Re-exports PipeWireHost so the new API is reachable via the platform module.
src/host/jack/mod.rs	Minor doc-comment wording adjustments now that PipeWire shares a similar configuration knob.

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