chore: Refactor: extract business logic to internal packages and upda…

[alexbednarczyk]

Summary of Changes

1. Dependencies & Environment:

   • Go Version: Updated go.mod to Go 1.24.0 (from 1.20).
   • Dependencies: Updated all dependencies to their latest versions, including cobra, viper, and spg.

2. Architecture Refactoring:

   • Separation of Concerns: Adopting best practices, I moved business logic out of the cmd/ directory (which should only
     handle CLI interaction) into a new internal/ directory.
   • New Packages: Created the following internal packages:
     • internal/count: Logic for the counting command.
     • internal/date: Logic for date command execution (abstracting OS commands).
     • internal/environment: Logic for environment variable handling and formatting.
     • internal/password: Logic for password/pin generation.
     • internal/config: Logic for configuration retrieval.
     • internal/version: Centralized version definition.

3. Code Quality & Cleanup:

   • Linting: Ran go vet and fixed issues (e.g., unused variables, structure initialization).
   • Formatting: Applied go fmt and goimports to ensure standard Go styling.
   • Dead Code Removal: Removed unused variables like theDate map in cmd/date.go and the local environment struct in
     cmd/environment.go.

4. Testing:

   • Unit Tests: Added unit tests for the extracted logic in:
     • internal/count
     • internal/environment
     • internal/password
   • Verification: Verified that go test ./... passes and the project builds successfully with go build.

The codebase is now cleaner, modular, easier to test, and uses modern Go versions and dependencies.