Alley | Next-Generation Practice Core

This foundational PR completely reorganizes the project to follow a modern "Package by Feature" convention. The new structure improves modularity, clarity, and aligns with best practices for large open-source Java projects. Key Principles of the New Structure: · Package by Feature: All distinct features are now located under a single feature package, consolidating the old base, game, and feature directories. Each feature is a self-contained module. · Clear Top-Level Modules: Introduced a clear separation of concerns at the highest level: · bootstrap: Plugin lifecycle and service loading. · core: Essential infrastructure (database, config, profiles). · common: Shared utilities, replacing the old tool and util packages. · library: Internal frameworks for commands and menus. · visual: Player-facing rendering (scoreboard, nametags, etc.). · adapter: Integrations with external plugins. · API vs. Internal Separation: Within each module, public APIs (interfaces, data objects) are kept at the root, while implementation details are encapsulated within an internal sub-package.

chore: prevent loading profiles upon kit creation, more robust and safe implementation for mongo data parsing and conversion, and fix scoreboard profile state variables where potential race conditions could occur