Enhance CLI output with ASCII sun art and suppress INFO log messages

[Copilot]

This PR improves the user experience of the Weather CLI application by adding visual enhancements and cleaning up console output.

Changes Made

🌞 ASCII Sun Art Enhancement

• Added beautiful ASCII sun graphics that display with weather information
• Created src/main/resources/art/sun.txt containing the sun artwork
• Implemented loadAsciiArt() method to load ASCII art from resources
• Added displayWeatherWithArt() method for enhanced weather display with improved formatting

🔇 Logger INFO Message Suppression

• Updated logging.properties to suppress INFO level messages from console output
• Changed console handler level from INFO to WARNING (only WARNING and SEVERE messages shown)
• Replaced logger INFO calls for usage messages with direct System.out.println to avoid formatting clutter
• Preserved SEVERE error messages for proper error reporting

Before vs After

Before:

[2025-06-17 12:25:30] [INFO   ] com.weather.app.WeatherApp main - Weather request for city: London 
Current Weather for London:
-------------------------------------
Weather for London:
Temperature: 22.5°C
Conditions: Clear sky

After:

         \   |   /
          \  |  /
       --- \ | / ---
           \ | /
        --- \|/ ---
      ====== * ======
        --- /|\ ---
           / | \
       --- / | \ ---
          /  |  \
         /   |   \

     ☀️  ☀️  ☀️  ☀️  ☀️  ☀️  ☀️

Current Weather for London:
========================================
Weather for London:
Temperature: 22.5°C
Conditions: Clear sky

Technical Details

• Minimal Changes: Only modified logging configuration and display logic
• Backward Compatibility: All existing functionality preserved
• Error Handling: SEVERE messages still properly displayed for debugging
• Resource Management: ASCII art loaded efficiently using try-with-resources
• Testing: All existing tests pass without modification

Validation

✅ Usage messages display cleanly without logger formatting
✅ SEVERE error messages remain visible for troubleshooting
✅ ASCII sun art displays correctly with weather data
✅ All tests pass
✅ Build and packaging work correctly

Fixes #10.

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.