Add Homebrew installation action to PV CLI

[Copilot]

This PR adds a new action to the PV CLI that allows users to install Homebrew package manager through the interactive TUI interface.

Changes

• New action package: internal/actions/homebrew/homebrew.go

  • Implements automatic action registration following PV CLI conventions
  • Executes the official Homebrew installation script from https://docs.brew.sh/Installation
  • Provides interactive installation with full user interaction support

• Updated: main.go

  • Added import to register the Homebrew action

Features

The action includes several smart features:

• Duplicate Prevention: Checks if Homebrew is already installed before attempting installation
• OS Validation: Returns a clear error message on Windows (Homebrew is not supported)
• Official Installation: Uses the exact command documented by Homebrew:

  curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh | /bin/bash

• Interactive Experience: Connects stdin/stdout/stderr to allow users to interact with the Homebrew installer prompts
• Structured Logging: Uses charmbracelet/log for consistent progress updates

Usage

Users can now select "Install Homebrew" from the PV CLI menu and follow the interactive prompts to install Homebrew on their macOS or Linux system.

Closes #[issue_number]

Original prompt

Please create an action to install homebrew. Plz consult https://docs.brew.sh/Installation for docs

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