feat: Rewrote the system architecture

[DaLaw2]

Rewrote the system architecture.

Removed the Event System and added the Actor System to address circular dependencies between components.
Adjusted project organization.
Removed some functionality.

[Copilot]

Pull Request Overview

This pull request implements a major architectural refactoring that replaces the Event System with an Actor System to address circular dependencies between components. The changes reorganize the project structure, remove file locking functionality, and introduce modern actor-based communication patterns.

• Event-driven architecture replaced with Actor System for better dependency management
• Removed file lock utilities and simplified backup options
• Reorganized module structure moving core models to separate hierarchical organization

Reviewed Changes

Copilot reviewed 70 out of 72 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/utils/mod.rs	Removes file_lock module export
src/utils/file_lock.rs	Completely removes file locking implementation
src/model/core/	New hierarchical model organization with actor, backup, gui, and schedule modules
src/core/infrastructure/	Infrastructure components moved to dedicated module
src/core/backup/	Backup engine refactored to use actor system instead of events
src/ui/	UI components updated to use actor system and new model structure
src/platform/	File system interfaces updated to use Path instead of PathBuf

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