feat(audio): make audio source user configurable

[tphakala]

Add Realtime.Audio.Source setting which allows user configurable audio source, it defaults to "sysdefault" on Linux. Audio clip retention policy settings are moved under Realtime.Audio.Export node.

[coderabbitai[bot]]

Walkthrough

The overarching change involves restructuring the audio settings in a software project, focusing on the Realtime functionality. This update introduces a more organized and nested structure for audio settings, including export paths, source selection, and retention policies, enhancing modularity and clarity across the configuration and codebase.

Changes

Files Affected	Summary of Changes
cmd/realtime/realtime.go, internal/analysis/processor/..., internal/httpcontroller/updateconfig.go	Updated references and paths for nested audio export settings.
internal/analysis/realtime.go, internal/conf/config.go, internal/conf/config.yaml, internal/conf/defaults.go	Restructured audio settings in configuration files and related functions to accommodate new nested format.
internal/myaudio/capture.go	Enhanced audio capture functionality with new imports and functions for device settings management.

🐰✨ In the code's warren, deep and wide, A change did hop — with stride and pride. Nesting deeper, paths align, Audio settings, now divine. Cheers to code, that grows more fine! 🎉🎵

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