feat: add COHERE_BASE_URL configuration for custom Cohere endpoints

[busla]

Summary

• Add COHERE_BASE_URL environment variable documentation to support custom Cohere endpoints
• Update web search features documentation with custom endpoint configuration option
• Add cohereApiUrl parameter to YAML configuration reference
• Enables use of custom Cohere endpoints, LiteLLM proxies, or self-hosted Cohere-compatible APIs for reranking

Changes Made

1. dotenv.mdx: Added COHERE_BASE_URL environment variable to the Web Search section
2. web_search.mdx: Added step 6 to Cohere setup instructions for optional custom endpoint configuration
3. web_search.mdx (YAML structure): Added cohereApiUrl parameter with documentation

Use Cases

• Custom Cohere endpoint deployments
• LiteLLM proxy configurations for Cohere
• Self-hosted Cohere-compatible reranking services
• Corporate firewalls requiring proxy endpoints

Related

• Implements documentation for: https://github.com/danny-avila/LibreChat/pull/9544

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