Update logic

[diego-ferrand]

This pull request introduces several improvements and refactorings to platform normalization, update handling, and test coverage for the Perfecto MCP project. The most significant changes include extracting platform normalization logic into a shared module, adding a new HTTP client configuration, refactoring update-related code for better modularity, and enhancing the CLI and test coverage for update flows.

Platform normalization and shared utilities:

• Extracted platform and architecture normalization logic from build.py and tools_manager.py into a new shared module config/platform_names.py, and updated all relevant usages to import from this module. This ensures consistent platform name handling across packaging, updater, and tests. [1] [2] [3] [4] [5]
• Added a new module config/http.py providing shared HTTP client defaults and a standardized user agent string for Perfecto MCP, decoupled from any tools-specific dependencies.

Update flow and CLI improvements:

• Added a --update CLI flag to main.py to trigger the interactive manual updater, and improved the exit banner to prompt users about the update option when running as a frozen binary. [1] [2] [3]
• Refactored the ASCII banner in main.py into a reusable _banner() function for consistent branding and messaging. [1] [2]
• Ensured that the update package and its modules are included in the build and packaging process by updating both the PyInstaller build list and the pyproject.toml configuration. [1] [2]

Test improvements and update guidance:

• Updated tests to use the new platform normalization helpers and the refactored match_recommended_asset function from the update.release module. Added new tests for update guidance messaging, including scenarios for both frozen binaries and source-based installs. [1] [2] [3] [4] [5]

These changes collectively improve maintainability, consistency, and user experience around platform detection and update flows.