docs(use-basilica): add deployment reference guides

[itzlambda]

Adds focused reference docs for Basilica deployment workflows and keeps the root skill as the routing layer.

Summary:

• Replace the misleading “large models -> rentals” guidance with deployment-first inference guidance.
• Add a large-model deployment reference covering vLLM/SGLang helpers, custom health checks, multi-GPU vLLM configuration, startup timeouts, and failure handling.
• Add a serverless deployment reference covering CLI deploys, SDK deploys, decorators, containers, custom Docker images, storage, GPU apps, WebSockets, public metadata, progress callbacks, async orchestration, and troubleshooting.
• Link both references from skills/use-basilica/SKILL.md so agents load details only when needed.

Validation:

• quick_validate.py skills/use-basilica passes.
• git diff --check upstream/main...HEAD passes.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch improve-serverless-deployment-skill

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