Add --player-volume option

[chatziko]

Adds a --player-volume CLI option (available in both the interactive player and daemon modes) that sets the player's initial output volume on startup, overriding the saved player_volume setting. Mirrors how existing options work (eg --static-delay-ms).

It's useful for always starting with a fixed volume, but also combined with volume hooks (which don't set an initial volume).

[Copilot]

Pull request overview

Adds a new --player-volume CLI option to control the player’s initial output volume at startup (in both TUI and daemon modes), intended to take precedence over the persisted player_volume setting.

Changes:

• Adds --player-volume argument parsing for the player and daemon subcommands.
• Plumbs player_volume through AppArgs / DaemonArgs and uses it when constructing AudioStreamHandler.
• Updates README settings table to reference the new CLI option.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 6 comments.

File	Description
sendspin/tui/app.py	Adds player_volume to AppArgs and uses it to initialize AudioStreamHandler.
sendspin/daemon/daemon.py	Adds player_volume to DaemonArgs and uses it to initialize AudioStreamHandler.
sendspin/cli.py	Adds --player-volume CLI flag and passes it into TUI/daemon argument structs.
README.md	Mentions --player-volume alongside the player_volume setting.

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