Add Modal documentation (DOCS-470)

[roboalchemist]

Summary

Add Modal serverless platform documentation to the llm-code-docs repository.

Modal is a serverless cloud platform optimized for running Python code with GPU acceleration, particularly for ML/AI inference workloads.

• Source: llms.txt (https://modal.com/llms.txt)
• Files: 1 comprehensive documentation file (modal-full.md)
• Size: 1.7 MB
• Path: docs/llms-txt/modal/

Documentation Coverage

The Modal documentation includes:

• Getting started and introduction
• Custom container images and environment configuration
• GPU and CUDA support
• Scaling, batching, and job queues
• Deployment and app management
• Sandboxes for isolated execution
• Secrets and environment variables
• Web endpoints and API serving
• Scheduled jobs and periodic tasks
• Distributed volumes and storage
• Reference documentation and API

Changes

• Added Modal to scripts/llms-sites.yaml (alphabetically after Mistral)
• Downloaded full llms.txt documentation from https://modal.com/
• Redacted Docker PAT example for security
• Updated index with Modal documentation entry

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