Enhanced Error Handling System for CLI Operations

Problem

Currently, the CLI provides generic error messages that make it difficult to:

• Identify the root cause of failures
• Debug issues effectively
• Provide meaningful feedback to users
• Track and handle different types of errors appropriately

Fixes #23

Solution

Implemented a comprehensive error handling system that:

1. Introduces structured error types with:

   • Validation errors (400)
   • Runtime errors (500)
   • System errors (500)

2. Provides detailed error context:

   • Error type classification
   • Human-readable messages
   • Detailed error descriptions
   • HTTP-style status codes

3. Improves error handling in file operations:

   • Project creation validation
   • Template copying errors
   • Directory operations
   • Resource cleanup

Implementation Details

• Created new errors package for centralized error handling
• Updated structure package to use typed errors
• Enhanced main.go with proper error handling
• Added validation for project names and language selection

Testing

The changes can be tested with:

go test ./...