Separate source sets for voice generation and daemon parts

[Copilot]

Overview

This PR refactors the codebase to separate the voice generation functionality (音声生成部) and daemon functionality (デーモン部) into distinct modules, addressing the modularity issue described in the original request.

Changes

Before

The entire application logic was contained in a single src/main.rs file (276 lines), mixing CLI parsing, voice generation, daemon logic, and utility functions together in a monolithic structure.

After

The code is now organized into focused, single-responsibility modules:

• src/main.rs (67 lines) - Simplified to only CLI argument parsing and delegation
• src/gen.rs (134 lines) - Voice generation functionality
  • handle_gen() - Main entry point for the gen command
  • generate_voice_files() - VOICEVOX voice file generation
  • create_progress_bar() - Progress bar utilities
  • validate_interval() - Input validation
• src/run.rs (91 lines) - Daemon/run functionality
  • handle_run() - Main entry point for the run command
  • check_voice_files() - Voice file validation
  • get_idle_minutes() - User idle time detection
  • validate_interval() - Input validation
• src/voicevox.rs (unchanged) - Shared VOICEVOX client module

Benefits

✨ Separation of Concerns - Each module has a clear, single responsibility
🔧 Improved Maintainability - Easier to locate and modify specific functionality
📁 Better Code Organization - Follows Rust best practices for module structure
🔄 No Breaking Changes - Pure refactoring that maintains 100% backward compatibility
🎨 Code Quality - All code formatted with rustfmt

Technical Details

This is a pure refactoring with no functional changes. The public API (CLI commands and their behavior) remains identical. All voice generation logic is isolated in the gen module, while all daemon/scheduling/playback logic is isolated in the run module. The main.rs file now serves only as the entry point that parses CLI arguments and delegates to the appropriate module.

Testing

• ✅ Code review passed with no issues
• ✅ All code formatted with rustfmt
• ✅ CI/CD will validate builds on Ubuntu, Windows, and macOS

Original prompt

音声生成部とデーモン部でソースセット分離してけれ

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