docs: add CUDA prereq warning to examples

[bbednarski9]

Description

Adds an explicit warning about CUDA compatibility requirements and note about why ai-dynamo does not need to be explicitly installed
Closes

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Summary by CodeRabbit

• Documentation
  • Clarified system requirements for Dynamo integration examples: a CUDA-compatible NVIDIA GPU and drivers are required; systems without NVIDIA GPUs are unsupported. Noted that provided Docker images include the necessary ai-dynamo packages.

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[coderabbitai]

Walkthrough

Three README files in the Dynamo integration examples were updated to add identical warning blocks stating CUDA/NVIDIA GPU hardware and driver requirements; Docker images include ai-dynamo packages and examples cannot run on non-NVIDIA systems.

Changes

Cohort / File(s)	Summary
CUDA Requirements Warnings examples/dynamo_integration/README.md, examples/dynamo_integration/react_benchmark_agent/README.md, external/dynamo/README.md	Added warning blocks under Software Requirements stating a CUDA-compatible device with NVIDIA drivers is required; examples cannot run on systems without NVIDIA GPU hardware; ai-dynamo packages are included in provided Docker images.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and accurately describes the main change: adding CUDA prerequisite warnings to example documentation using imperative mood and within the character limit.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[mnajafian-nv]

LGTM!
Minor suggestions

1. The warning emoji (⚠️) is redundant since > [!WARNING] already adds a warning indicator in most markdown renderers.
2. In technical documentation, avoid contractions like "do not" should be preferred over "don't".

[willkill07]

/merge