Renamed all MCP tools with descriptive, consistent naming:
- web_search → websearch_basic
- web_search_with_content → websearch_with_content
- deep_web_search → websearch_multi_engine
- search_and_aggregate → websearch_ai_summary

Benefits:
- Clear websearch_ prefix for all web search tools
- Descriptive suffixes indicating functionality
- Eliminates confusion for AI/LLM tool selection
- Consistent naming convention across all tools

Documentation updates:
- Updated README.md tool descriptions
- Removed "NEW" emphasis from websearch_ai_summary
- Updated demo application output
- Consistent tool naming in all examples

This improves the developer and AI experience when working with MCP tools.