feat(generator): Add init command to generate fuku.yaml from template

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Added init to generate configuration file with options for profile, service, force, and dry-run

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Pull Request Overview

This PR adds an init command to generate a fuku.yaml configuration file from a template. Users can customize the generated file with options for profile name, service name, and control generation behavior with force and dry-run flags.

Key Changes:

• Added generator package with template-based configuration file generation
• Integrated init command into CLI with support for --profile, --service, --force, and --dry-run flags
• Included comprehensive test coverage for generator functionality

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
internal/app/module.go	Registers the generator module in the dependency injection container
internal/app/generator/templates/fuku.yaml.tmpl	Template for generating fuku.yaml with customizable service and profile names
internal/app/generator/module.go	Defines the generator module for dependency injection
internal/app/generator/generator_test.go	Comprehensive test suite covering generation scenarios including defaults, custom options, file existence, force overwrite, and dry-run mode
internal/app/generator/generator_mock.go	Generated mock implementation for testing
internal/app/generator/generator.go	Core generator implementation with template parsing and file writing logic
internal/app/cli/cli_test.go	Updated CLI tests to include generator dependency
internal/app/cli/cli.go	Added init command handler and integrated generator into CLI workflow

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