v1.7.0 - CKPool Multi-Region Support

✨ New Features

• CKPool Pool Region Selection: Choose between EU pool (eusolostats.ckpool.org) and Global pool (solo.ckpool.org)
• Automatic Format Detection: Seamlessly handles both EU pool format (integers in H/s) and Global pool format (strings with units like "3.12T")
• Default to EU Pool: Pre-selected for European users

🐛 Bug Fixes

• Fix CKPool sensor showing "Unknown" for addresses without mining history (now shows 0 GH/s)
• Handle HTTP 404 responses gracefully
• Parse JSON response correctly instead of attempting HTML parsing

🔧 Improvements

• Robust hashrate unit conversion supporting K, M, G, T, P units
• Better error handling and logging
• Add bestshare attribute to sensor

📝 Notes

• Existing CKPool sensors will default to EU pool - reconfigure if using Global pool
• Hashrate displayed in GH/s for consistency