Reorganize blockpy.js file into logical modular structure

[Copilot]

This PR addresses the issue of the monolithic src/blockpy.js file by breaking it down into a more logical and maintainable modular organization.

Problem

The original src/blockpy.js file was 1,282 lines long and contained multiple concerns mixed together:

• Initial model configuration and setup
• Complex UI model methods and computed observables
• Component initialization logic
• Application lifecycle management

This made the code difficult to navigate, maintain, and understand.

Solution

The file has been reorganized into focused modules with clear separation of concerns:

New Structure:

• src/model/model-config.js (366 lines) - Handles initial model configuration, including user settings, assignment data, submission data, display options, status tracking, execution state, and configuration constants
• src/model/ui-model.js (687 lines) - Contains all UI-related computed observables and methods for menus, files, editors, execution controls, feedback handling, tracing, and server interactions
• src/components/component-initializer.js (44 lines) - Manages initialization of all BlockPy components (dialog, feedback, console, engine, file system, editors, server, etc.)
• src/blockpy.js (278 lines) - Now focused purely on the main BlockPy class and application lifecycle

Benefits:

• 78% reduction in main file size (1,282 → 278 lines)
• Clear separation of concerns following single responsibility principle
• Improved maintainability - developers can easily find specific functionality
• Better code organization - related functionality is grouped together
• 100% backward compatibility - no functional changes, only structural improvements

Implementation Details

• All functionality has been preserved exactly as it was
• Imports and exports have been carefully maintained for backward compatibility
• The build process works identically to before
• All linting passes without errors
• No breaking changes to the public API

The src/blockpy.js file now serves as a clean entry point focused on the core BlockPy class, while the complex configuration and UI logic has been moved to appropriate specialized modules.

Fixes #136.

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