v.0.3.7.1-neo4j-graph-integration

Implement Neo4j integration and update AI clients

• Update Cargo.toml with new dependencies
• Modify config.json to include Neo4j settings
• Refactor cohere_client.rs and google_ai_client.rs for graph compatibility
• Enhance config.rs to support new Neo4j configuration
• Implement Neo4j client functionality in neo4j_client.rs
• Update main.rs to incorporate graph-based operations
• Gitignore .idea/ directory

This commit advances the graph integration feature, improving AI client
interactions with the Neo4j database and setting up the groundwork for
more sophisticated data operations.