customize/apps/pulse-effects: add .pa config support, refactor preset paths

[Copilot]

Extends the pulse-effects module to support user-defined PulseAudio .pa config files, and reorganizes the profile directory structure for presets.

Changes

• Preset path refactor: moved preset lookup from apps/pulse-effects/global.d / local.d to apps/pulse-effects/preset / preset/local.d
• New .pa config support: added _install-config() — installs .pa files from apps/pulse-effects/config (and config/local.d for local overrides) into /etc/pulse/default.pa.d/ with sudo install --mode=0644
• Example profile: renamed global.d/ → preset/; added config/zephyr.pa as a sample config
• Docs: updated docs/reference/modules.md to document all four new profile paths

New profile layout

apps/pulse-effects/
├── preset/          # global output presets  (was: global.d/)
│   └── local.d/     # profile-specific presets  (was: local.d/)
├── config/          # .pa files → /etc/pulse/default.pa.d/  [new]
│   └── local.d/     # profile-specific .pa files  [new]

Original prompt

improve customize/apps/pulse-effects module by adding a new feature: support for a user-defined .pa files to configure pulse-effects. This config file is stored in the profile (apps/pulse-effects/config). When running this module, this file is installed into /etc/pulse/default.pa.d/ directory. Refactor the module to look for presets in `apps/pulse-effects/preset. Update examples and docs too.

The user has attached the following file paths as relevant context:

• .github/copilot-instructions.md

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