feat: Replace CoinGecko with CryptoCompare/Etherscan APIs

- Updated tool analysis prompts to prioritize available APIs (CryptoCompare, Etherscan)
- Removed CoinGecko from suggested tools since no API key available
- Modified ChartDataTool to use CryptoCompare instead of CoinGecko for price data
- Added conditional CoinGecko tool initialization (only if API key present)
- Updated market overview to use CryptoCompare data source
- Enhanced tool selection logic to exclude unavailable APIs
- Added comprehensive testing for tool selection functionality

test_chart_tool.py

@@ -1,49 +0,0 @@
-#!/usr/bin/env python3
-"""
-Quick test for ChartDataTool cleanup functionality
-"""
-
-import asyncio
-import sys
-import os
-
-# Add src to path
-sys.path.insert(0, os.path.join(os.path.dirname(__file__), 'src'))
-
-from src.tools.chart_data_tool import ChartDataTool
-
-async def test_chart_tool_cleanup():
-    """Test that ChartDataTool works and cleanup doesn't throw errors"""
-    print("🧪 Testing ChartDataTool...")
-    
-    tool = ChartDataTool()
-    
-    try:
-        # Test basic functionality
-        print("📊 Testing price chart data...")
-        result = await tool._arun("price_chart", "bitcoin", "7d")
-        print(f"✅ Chart data result: {len(result)} characters")
-        
-        # Test cleanup method exists and works
-        print("🧹 Testing cleanup method...")
-        await tool.cleanup()
-        print("✅ Cleanup method executed successfully")
-        
-        return True
-        
-    except Exception as e:
-        print(f"❌ Test failed: {e}")
-        return False
-
-async def main():
-    success = await test_chart_tool_cleanup()
-    if success:
-        print("\n🎉 All tests passed!")
-        return 0
-    else:
-        print("\n❌ Tests failed!")
-        return 1
-
-if __name__ == "__main__":
-    exit_code = asyncio.run(main())
-    sys.exit(exit_code)