Refactor Framework to Package-Based Monorepo Structure

Description

Currently, the framework is a monolithic library with a mix of "Libraries", "Modules", and core components in src/. This structure creates tight coupling and unclear boundaries (e.g., Config depending on Loader which depends on App).

We propose moving to a Monorepo Structure using a packages/ directory. This will allow for:

1. Strict Decoupling: Each package has its own src and explicit dependencies.
2. Clearer Architecture: Separation of Core (Kernel) from App (Adapters) and Features (Http, Database).
3. Future-Proofing: Easier to extract/publish standalone components.

Proposed Structure

The src/ directory will be dissolved into packages/.

/packages
  ├── Core/          (Bootstrap: App Kernel, Container, Config, Loader, Env, Hook)
  ├── App/           (Glue: Web/Console Adapters, Traits)
  ├── Http/          (Request, Response, Middleware)
  ├── Console/       (Commands, Output)
  ├── Pipeline/      (New Shared Pipe Builder)
  ├── Database/      (ORM, Migrations)
  ├── Security/      (Csrf, Encryption, Hasher)
  ├── ...            (See full plan for Auth, Session, etc.)

Synergy with Issue #373 (App Bootstrapping)

This refactoring directly supports the goals of Issue #373:

• Boot Pipeline: The new packages/Pipeline component enables the "Boot Stages" logic.
• Explicit Kernel: Moving App, Container, and Loader to packages/Core physically defines the "Application Execution Boundary".
• DI Ownership: Centralizing Container in Core makes it the clear owner of service lifetimes.

Critical Changes

• Split App: src/App/App.php moves to packages/Core. src/App/Adapters moves to packages/App. This resolves the circular dependency between the Kernel and the Http layer.
• Config in Core: src/Config moves to packages/Core to resolve dependencies on Loader and Di.
• Security Grouping: Csrf, Encryption, and Hasher are grouped under packages/Security.

Migration Checklist

• Create packages/ directory structure.
• Phase 1: Core: Move App, Di, Environment, Hook, Loader, Config, Tracer to packages/Core.
• Phase 2: Features: Move Auth, Database, Session, View, Validation to packages/*.
• Phase 3: Http/Console: Move Http, Console, Router to packages/*.
• Phase 4: App Glue: Move Adapters and Traits to packages/App.
• Phase 5: Cleanup: Remove empty src/ directories.
• Phase 6: Wiring: Update root composer.json autoloading to map Quantum\ to these new paths.
• Run tests to verify the move.

Start by reviewing the current src/ layout, the proposed packages/ phases, and root composer.json autoloading. Work through the migration checklist from Core through App Glue, then run the test suite to verify the move. Done means the planned packages exist, src/ is removed, autoloading is updated, and tests pass.